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astrounijena

Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

Search For Visual Stellar Companions

Thomas Eisenbeiss

Astrophysikalisches Institut und Universitäts - Sternwarte Jena

Seminar: Multiple Star Systems


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

ABOUT BINARIES

200 billions of stars in the galaxy

Most of the are multiple

Visual binaries are seen separated through a telescope

Definition depends on resolution of the observing

technique

Number of known visual binaries increases with

developing of the observatories (adaptive optics,

interferometry, space observatories)


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

ABOUT BINARIES

200 billions of stars in the galaxy

Most of the are multiple

Visual binaries are seen separated through a telescope

Definition depends on resolution of the observing

technique

Number of known visual binaries increases with

developing of the observatories (adaptive optics,

interferometry, space observatories)


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

ABOUT BINARIES

200 billions of stars in the galaxy

Most of the are multiple

Visual binaries are seen separated through a telescope

Definition depends on resolution of the observing

technique

Number of known visual binaries increases with

developing of the observatories (adaptive optics,

interferometry, space observatories)


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

ABOUT BINARIES

200 billions of stars in the galaxy

Most of the are multiple

Visual binaries are seen separated through a telescope

Definition depends on resolution of the observing

technique

Number of known visual binaries increases with

developing of the observatories (adaptive optics,

interferometry, space observatories)


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

ABOUT BINARIES

200 billions of stars in the galaxy

Most of the are multiple

Visual binaries are seen separated through a telescope

Definition depends on resolution of the observing

technique

Number of known visual binaries increases with

developing of the observatories (adaptive optics,

interferometry, space observatories)


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

FICTIOUS QUADRUPLE SYSTEM


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

VISUAL BINARY


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

HERSCHEL’S BINARY

First binary - Castor -

discovered by Herschel

1790

Long term

measurements gave the

orbit of the binary

FIGURE: Herschel’s binary

Castor


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

HERSCHEL’S BINARY

First binary - Castor -

discovered by Herschel

1790

Long term

measurements gave the

orbit of the binary

FIGURE: Herschel’s binary

Castor


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

WHAT IS THE SSS

Digitalization of the Sky, from photographic Schmidt

plates

Data contents UKST red and infrared observation and

POS observation from 1. and 2. epoch

SuperCOSMOS machine is operated at Edinburgh and

is a fast, high-precision plate scanning facility with

0.67-arcsec per pixel and accurate positional capability


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

WHAT IS THE SSS

Digitalization of the Sky, from photographic Schmidt

plates

Data contents UKST red and infrared observation and

POS observation from 1. and 2. epoch

SuperCOSMOS machine is operated at Edinburgh and

is a fast, high-precision plate scanning facility with

0.67-arcsec per pixel and accurate positional capability


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

WHAT IS THE SSS

Digitalization of the Sky, from photographic Schmidt

plates

Data contents UKST red and infrared observation and

POS observation from 1. and 2. epoch

SuperCOSMOS machine is operated at Edinburgh and

is a fast, high-precision plate scanning facility with

0.67-arcsec per pixel and accurate positional capability


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

FIRST LOOK AT THE DATA

FIGURE: HD113449 in 3 plates form the 1950’s to the 90’s


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

FIRST LOOK AT THE DATA

FIGURE: HD 96064 in 3 plates form the 1950’s to the 90’s


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

FIRST LOOK AT THE DATA

FIGURE: HD141272 in 3 plates form the 1950’s to the 90’s


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

A BRIEF EXPLANATION

All sky survey in the near infrared

Two highly-automated 1.3m telescopes, Mt. Hopkins,

AZ and CTIO, Chile

Three-channel camera, for simultaneous observation in

J (1.25 microns), H (1.65 microns) and Ks (2.17

microns)

Operated from 1997 to 2001


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

A BRIEF EXPLANATION

All sky survey in the near infrared

Two highly-automated 1.3m telescopes, Mt. Hopkins,

AZ and CTIO, Chile

Three-channel camera, for simultaneous observation in

J (1.25 microns), H (1.65 microns) and Ks (2.17

microns)

Operated from 1997 to 2001


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

A BRIEF EXPLANATION

All sky survey in the near infrared

Two highly-automated 1.3m telescopes, Mt. Hopkins,

AZ and CTIO, Chile

Three-channel camera, for simultaneous observation in

J (1.25 microns), H (1.65 microns) and Ks (2.17

microns)

Operated from 1997 to 2001


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

A BRIEF EXPLANATION

All sky survey in the near infrared

Two highly-automated 1.3m telescopes, Mt. Hopkins,

AZ and CTIO, Chile

Three-channel camera, for simultaneous observation in

J (1.25 microns), H (1.65 microns) and Ks (2.17

microns)

Operated from 1997 to 2001


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

A FIRST LOOK AT THE 2MASS DATA

FIGURE: 2Mass observation of HD 113449 in J-band


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

A FIRST LOOK AT THE 2MASS DATA

FIGURE: 2Mass observation of HD 96064 in J-band


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

A FIRST LOOK AT THE 2MASS DATA

FIGURE: 2Mass observation of HD 141272 in J-band


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

HOW THE SE WORKS

Determining background,

all pixels above a certain

threshold belong to

objects

Saddle point in the

intensity distribution →

object is split in 2

Output into a catalog

FIGURE: illustration of the

thresholding of the SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

HOW THE SE WORKS

Determining background,

all pixels above a certain

threshold belong to

objects

Saddle point in the

intensity distribution →

object is split in 2

Output into a catalog

FIGURE: illustration of the

thresholding of the SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

HOW THE SE WORKS

Determining background,

all pixels above a certain

threshold belong to

objects

Saddle point in the

intensity distribution →

object is split in 2

Output into a catalog

FIGURE: illustration of the

thresholding of the SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

1 Measure background

and noise

2 Subtract background

3 Filter

4 Find objects

(thresholding)

5 Deblend objects (break

up detection into different

objects)

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

1 Measure background

and noise

2 Subtract background

3 Filter

4 Find objects

(thresholding)

5 Deblend objects (break

up detection into different

objects)

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

1 Measure background

and noise

2 Subtract background

3 Filter

4 Find objects

(thresholding)

5 Deblend objects (break

up detection into different

objects)

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

1 Measure background

and noise

2 Subtract background

3 Filter

4 Find objects

(thresholding)

5 Deblend objects (break

up detection into different

objects)

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

1 Measure background

and noise

2 Subtract background

3 Filter

4 Find objects

(thresholding)

5 Deblend objects (break

up detection into different

objects)

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

6 Measure shapes and

positions

7 Clean

8 Perform photometry

9 Classify (star like, or

galactic)

10 Output Catalog

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

6 Measure shapes and

positions

7 Clean

8 Perform photometry

9 Classify (star like, or

galactic)

10 Output Catalog

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

6 Measure shapes and

positions

7 Clean

8 Perform photometry

9 Classify (star like, or

galactic)

10 Output Catalog

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

6 Measure shapes and

positions

7 Clean

8 Perform photometry

9 Classify (star like, or

galactic)

10 Output Catalog

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STEPS IN DETAIL

6 Measure shapes and

positions

7 Clean

8 Perform photometry

9 Classify (star like, or

galactic)

10 Output Catalog

FIGURE: flow diagram of SE


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOME EXAMPLES


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOME EXAMPLES


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOME EXAMPLES

FIGURE: Source extraction of the field around HD 96064


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOME EXAMPLES

FIGURE: Source extraction of the field around HD 141272


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOME EXAMPLES

FIGURE: Source extraction of the field around HD 141272


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SPIKE INTERPOLATION

WHAT IS THIS?

Saturated stars produce diffraction spikes due to the

clamp of the telescope

caused by to long exposure time

WHY IS THIS USEFUL?

Spikes are symmetric to the center of the flux

→ accurate method to measure the astrometric position

of a saturated star


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SPIKE INTERPOLATION

WHAT IS THIS?

Saturated stars produce diffraction spikes due to the

clamp of the telescope

caused by to long exposure time

WHY IS THIS USEFUL?

Spikes are symmetric to the center of the flux

→ accurate method to measure the astrometric position

of a saturated star


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SPIKE INTERPOLATION

WHAT IS THIS?

Saturated stars produce diffraction spikes due to the

clamp of the telescope

caused by to long exposure time

WHY IS THIS USEFUL?

Spikes are symmetric to the center of the flux

→ accurate method to measure the astrometric position

of a saturated star


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SPIKE INTERPOLATION

WHAT IS THIS?

Saturated stars produce diffraction spikes due to the

clamp of the telescope

caused by to long exposure time

WHY IS THIS USEFUL?

Spikes are symmetric to the center of the flux

→ accurate method to measure the astrometric position

of a saturated star


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

AN EXAMPLE

FIGURE: The common proper motion pair HD139777 and

HD139813 and its diffraction spikes


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

AN EXAMPLE

FIGURE: The common proper motion pair HD139777 and

HD139813 and its diffraction spikes


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

AN EXAMPLE

FIGURE: The common proper motion pair HD139777 and

HD139813 and its diffraction spikes


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

AN EXAMPLE

FIGURE: The common proper motion pair HD139777 and

HD139813 and its diffraction spikes


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALCULATION

declination

80.49

80.48

80.47

80.46

80.45

80.44

80.43

80.42

80.41

Spike Interpolation of HD139777 and HD139813

80.4

232 232.1 232.2 232.3

right accession

232.4 232.5 232.6


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALCULATION

declination

80.49

80.48

80.47

80.46

80.45

80.44

80.43

80.42

80.41

Spike Interpolation of HD139777 and HD139813

80.4

232 232.1 232.2 232.3 232.4 232.5 232.6

right accession


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

FIRST AN EXAMPLE

FIGURE: Picture HD113449 from 1956 and overlayed 2mass

catalog from 1999


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALCULATION

Motion on the sky calculated by position measures at

different epochs

pmRA =

� �

δ1 + δ2

(α2 − α1) · cos

·

2

1

∆t

pmDEC = (δ2 − δ1) · 1

∆t


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALCULATION

Motion on the sky calculated by position measures at

different epochs

pmRA =

� �

δ1 + δ2

(α2 − α1) · cos

·

2

1

∆t

pmDEC = (δ2 − δ1) · 1

∆t


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

FINDINGS

FIGURE: Picture HD141272 from 1950 and overlayed 2mass

catalog from 2000


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

PROBLEMS

FIGURE: Unclean detections and sources of errors


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CONVERTING INTO DATA PLOTS


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CONVERTING INTO DATA PLOTS


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CONVERTING INTO DATA PLOTS

δ [deg]

1.7

1.65

1.6

1.55

1.5

1.45

1.4

Das Sternfeld rund um HD141272.

Super Cosmos Aufnahme vom 17.6.1950, 2MASS Aufnahme vom 29.4.2000

237.15

237.1

57

141272

237.05

α [deg]

237

236.95

236.9


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CONVERTING INTO DATA PLOTS

δ [deg]

1.581

1.58

1.579

1.578

1.577

1.576

1.575

1.574

1.573

1.572

1.571

Das Sternfeld rund um HD141272.

Super Cosmos Aufnahme vom 17.6.1950, 2MASS Aufnahme vom 29.4.2000

237.046 237.045 237.044 237.043 237.042

57

141272

237.041 237.04

α [deg]

237.039 237.038 237.037 237.036


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOURCES OF ERRORS

Errors of calibration

problematic

Error of PSF fitting

o.k.

Error of nonlinear field distortions

nearly impossible


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOURCES OF ERRORS

Errors of calibration

problematic

Error of PSF fitting

o.k.

Error of nonlinear field distortions

nearly impossible


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOURCES OF ERRORS

Errors of calibration

problematic

Error of PSF fitting

o.k.

Error of nonlinear field distortions

nearly impossible


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOURCES OF ERRORS

Errors of calibration

problematic

Error of PSF fitting

o.k.

Error of nonlinear field distortions

nearly impossible


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

SOURCES OF ERRORS

Errors of calibration

problematic

Error of PSF fitting

o.k.

Error of nonlinear field distortions

nearly impossible


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

FIELD DISTORTIONS

FIGURE: Examples on field distortions


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

IDEA

Quantitative handling of all sources of error is to difficult

→ Calculation of statistical errors from background

stars, which should not, or not noticeable move on the

sky

Standard deviation of the proper motion of the

background stars = error estimate


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

IDEA

Quantitative handling of all sources of error is to difficult

→ Calculation of statistical errors from background

stars, which should not, or not noticeable move on the

sky

Standard deviation of the proper motion of the

background stars = error estimate


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

IDEA

Quantitative handling of all sources of error is to difficult

→ Calculation of statistical errors from background

stars, which should not, or not noticeable move on the

sky

Standard deviation of the proper motion of the

background stars = error estimate


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STATISTICAL PLOTS

70

60

50

40

30

20

10

σ = 32.0971

m = −4.4232

count = 0

∆Ra SSS Hist für POSI/POSII

0

−200 −100 0 100 200 300

70

60

50

40

30

20

10

σ = 31.5954

m = −2.7352

count = 0

∆Dec SSS Hist für POSI/POSII

0

−200 −100 0 100 200 300

70

60

50

40

30

20

10

σ = 30.6007

m = −6.6715

count = 0

∆Ra GAIA Hist für POSI/POSII

0

−200 −100 0 100 200 300

100

80

60

40

20

σ = 39.8575

m = −5.9931

count = 0

∆Dec GAIA Hist für POSI/POSII

0

−400 −200 0 200 400

FIGURE: Histograms of 2 samples of Data with overlayed normal

distribution


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STATISTICAL PLOTS

20

15

10

5

σ = 32.0971

m = −4.4232

count = 1

∆Ra SSS Hist für POSI/POSII

0

−80 −60 −40 −20 0 20 40

20

15

10

5

σ = 31.5954

m = −2.7352

count = 1

∆Dec SSS Hist für POSI/POSII

0

−60 −40 −20 0 20 40

20

15

10

5

σ = 30.6007

m = −6.6715

count = 1

∆Ra GAIA Hist für POSI/POSII

0

−80 −60 −40 −20 0 20

20

15

10

5

σ = 39.8575

m = −5.9931

count = 1

∆Dec GAIA Hist für POSI/POSII

0

−60 −40 −20 0 20 40

FIGURE: Histograms of 2 samples of Data with overlayed normal

distribution


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STATISTICAL PLOTS

12

σ = 12.7175

m = −5.7572

10

count = 2

8

6

4

2

∆Ra SSS Hist für POSI/POSII

0

−40 −30 −20 −10 0 10 20

∆Dec SSS Hist für POSI/POSII

14

σ = 12.1352

12 m = −5.5343

count = 2

10

8

6

4

2

0

−30 −20 −10 0 10 20

14

σ = 12.8852

12 m = −7.2779

count = 2

10

8

6

4

2

∆Ra GAIA Hist für POSI/POSII

0

−40 −30 −20 −10 0 10 20

20

15

10

5

σ = 12.3244

m = −6.4485

count = 2

∆Dec GAIA Hist für POSI/POSII

0

−40 −30 −20 −10 0 10 20

FIGURE: Histograms of 2 samples of Data with overlayed normal

distribution


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

STATISTICAL PLOTS

14

σ = 9.158

12 m = −4.4568

count = 2

10

8

6

4

2

∆Ra SSS Hist für POSI/POSII

0

−40 −30 −20 −10 0 10 20

12

σ = 9.0835

m = −5.1908

10

count = 2

8

6

4

2

∆Dec SSS Hist für POSI/POSII

0

−30 −20 −10 0 10 20

16

14

12

10

8

6

4

2

σ = 7.6692

m = −5.0571

count = 3

∆Ra GAIA Hist für POSI/POSII

0

−30 −20 −10 0 10 20

16

14

12

10

8

6

4

2

σ = 8.9557

m = −5.6855

count = 5

∆Dec GAIA Hist für POSI/POSII

0

−40 −30 −20 −10 0 10 20

FIGURE: Histograms of 2 samples of Data with overlayed normal

distribution


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

ABSOLUTE ASTROMETRY

µ δ [mas/yr]

50

0

−50

−100

−150

−200

50

2000

0

0

−2000

∆ α [mas]

−4000

−50

−100

µ cos δ [mas/yr]

α

FIGURE: HD141272 pm plot of first and second epoch

−6000

−150

−8000

−200

2000

0

−2000

−4000

−6000

−8000

∆ δ [mas]


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALA ALTO OBSERVATIONS

FIGURE: Cala Alto H-band observation of HD 141272


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALA ALTO OBSERVATIONS

FIGURE: Cala Alto H-band observation of HD 141272


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALA ALTO OBSERVATIONS

FIGURE: Cala Alto H-band observation of HD 141272


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

ABSOLUTE ASTROMETRY II

µ δ [mas/yr]

100

50

0

−50

−100

−150

−200

50

200

0

0

−200

−50

−400

∆ α [mas]

−600

−100

µ cos δ [mas/yr]

α

FIGURE: HD141272 pm plot of second and third epoch

−800

−150

−1000

−1200

−200

−1400

0

−250

500

−500

−1000

∆ δ [mas]


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

IDEA

Analyze relative distance and position angle of 2 stars

without using the absolute position in different time

epochs

if both are not changing in time the system is co-moving


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

IDEA

Analyze relative distance and position angle of 2 stars

without using the absolute position in different time

epochs

if both are not changing in time the system is co-moving


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALCULATION

dα =

� �

δ1 + δ2

|α1 − α2| · cos

2

dδ = |δ1 − δ2|

dα =

� � δ1 + δ2 |α1 − α2| · cos

2


∆dα

=

=

|δ1 − δ2| �

(∆α1) 2 + (∆α2) 2 · cos2 ∆dδ =

� δ1 + δ2 2


(∆δ1) 2 + (∆δ2) 2

r

Φ

(∆r)

=

=


(dα2 ) + (dδ) 2

� � dδ

arctan


2

= (∆dα) 2

� ∂r

∂dα

(∆Φ) 2

= (∆dδ) 2


�2 + (∆dδ) 2

� �2 ∂r

∂dδ

� �2 � �2 ∂Φ ∂Φ

+ (∆dα) 2


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALCULATION

∆dα =

∆dδ =


(∆α1) 2 + (∆α2) 2 · cos2 � �

δ1 + δ2

2


(∆δ1) 2 + (∆δ2) 2

dα =

� � δ1 + δ2 |α1 − α2| · cos

2


∆dα

=

=

|δ1 − δ2| �

(∆α1) 2 + (∆α2) 2 · cos2 ∆dδ =

� δ1 + δ2 2


(∆δ1) 2 + (∆δ2) 2

r

Φ

(∆r)

=

=


(dα2 ) + (dδ) 2

� � dδ

arctan


2

= (∆dα) 2

� ∂r

∂dα


�2 + (∆dδ) 2

� �2 ∂r

∂dδ

� � � �


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALCULATION

r =


(dα2 ) + (dδ) 2

Φ =

� �


arctan


dα =

� � δ1 + δ2 |α1 − α2| · cos

2


∆dα

=

=

|δ1 − δ2| �

(∆α1) 2 + (∆α2) 2 · cos2 ∆dδ =

� δ1 + δ2 2


(∆δ1) 2 + (∆δ2) 2

r

Φ

(∆r)

=

=


(dα2 ) + (dδ) 2

� � dδ

arctan


2

= (∆dα) 2

� ∂r

∂dα

(∆Φ) 2

= (∆dδ) 2


�2 + (∆dδ) 2

� �2 ∂r

∂dδ

� �2 � �2 ∂Φ ∂Φ

+ (∆dα) 2


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALCULATION

(∆r) 2 = (∆dα) 2


∂r

∂dα

(∆Φ) 2 = (∆dδ) 2


∂Φ

∂dδ

� 2

� 2

+ (∆dδ) 2


∂r

∂dδ

+ (∆dα) 2


∂Φ

∂dα

dα =

� � δ1 + δ2 |α1 − α2| · cos

2


∆dα

=

=

|δ1 − δ2| �

(∆α1) 2 + (∆α2) 2 · cos2 ∆dδ =

� δ1 + δ2 2


(∆δ1) 2 + (∆δ2) 2

r

Φ

(∆r)

=

=


(dα2 ) + (dδ) 2

� � dδ

arctan


2

= (∆dα) 2

� ∂r

∂dα

2 2


�2 + (∆dδ) 2

� �2 ∂r

∂dδ

� �2 � �2 ∂Φ ∂Φ

2

� 2

� 2


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

CALCULATION

dα =

� δ1 + δ2 |α1 − α2| · cos

2


∆dα

=

=

|δ1 − δ2| �

(∆α1) 2 + (∆α2) 2 · cos2 ∆dδ =

� � δ1 + δ2 2


(∆δ1) 2 + (∆δ2) 2

r

Φ

(∆r)

=

=


(dα2 ) + (dδ) 2

� � dδ

arctan


2

= (∆dα) 2

� �2 ∂r

+ (∆dδ)

∂dα

2

(∆Φ)

� �2 ∂r

∂dδ

2

= (∆dδ) 2

� �2 ∂Φ

+ (∆dα)

∂dδ

2

� �2 ∂Φ

∂dα


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

RELATIVE PLOT I

sep [arcsec]

30

28

26

24

22

20

18

3 3.5 4 4.5 5 5.5

x 10 4

16

JD−2400000.5

pa [ ° ]

380

375

370

365

360

355

3 3.5 4 4.5 5 5.5

x 10 4

350

JD−2400000.5

FIGURE: Relative plot of HD141272 and its companion


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

ORBITAL MOVEMENT

a[AU] =

T [yr] =

δΦ = 360

T

δr = 4d

T

d[pc]

plx[arcsec]


a3 [AU]

(M1 + M2)[M⊙]

· tepoch

· tepoch


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

RELATIVE PLOT II

sep [arcsec]

30

28

26

24

22

20

18

3 3.5 4 4.5 5 5.5

x 10 4

16

JD−2400000.5

pa [ ° ]

380

375

370

365

360

355

3 3.5 4 4.5 5 5.5

x 10 4

350

JD−2400000.5

FIGURE: Relative plot of HD141272 and its companion


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

PARALACTIC WOBBLING

FIGURE: Explanation of

paralactic wobbling

A Star in the foreground

moves relative to the sky

when seen from different

positions around the sun and

so the projected distance and

position angle wobbles during

one year.


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

RELATIVE PLOT III

sep [arcsec]

30

28

26

24

22

20

18

3 3.5 4 4.5 5 5.5

x 10 4

16

JD−2400000.5

pa [ ° ]

380

375

370

365

360

355

3 3.5 4 4.5 5 5.5

x 10 4

350

JD−2400000.5

FIGURE: Relative plot of HD141272 and its companion


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

OUTLINE

1 INTRODUCTION

Some interesting stuff about (visual) binaries

Nice pictures

2 DATA ACCESS

The Super Cosmos Sky Survey

The 2 Micron All Sky Survey

3 FROM THE IMAGE TO ACCURATE MEASUREMENTS

The GAIA Source Extractor

Spike interpolation

Calculating the proper motion

Errors

Calculating statistical errors

4 RESULTS AND FURTHER INVESTIGATIONS

Absolute Astrometry

Relative Astrometry

TBD


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

NEXT TASKS

HD141272 has a companion

determine spectral type and mass of the companion

and age of the system

search for more stars with companions in the Her-Lyr

association


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

NEXT TASKS

HD141272 has a companion

determine spectral type and mass of the companion

and age of the system

search for more stars with companions in the Her-Lyr

association


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

NEXT TASKS

HD141272 has a companion

determine spectral type and mass of the companion

and age of the system

search for more stars with companions in the Her-Lyr

association


Search For

Visual Stellar

Companions

Thomas

Eisenbeiss

Introduction

Some interesting

stuff about (visual)

binaries

Nice pictures

Data Access

The Super Cosmos

Sky Survey

The 2 Micron All

Sky Survey

From The

Image To

Accurate

Measurements

The GAIA Source

Extractor

Spike interpolation

Calculating the

proper motion

Errors

Calculating

statistical errors

Results And

End

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