Visible Spectrum

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(B-V) Color Index• Counting the number of photons which pass through a filter andcomparing to another filter will tell us the temperature of a star• A hot blue star has a (B-V) = -0.1 and (B-V)=1.5 for a cool red star
Carbon Atom in Ground State• Six electrons populatingmany energy levels givesmuch more complexspectrum
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Visible Spectrum• Prism splits Vi
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Electromagnetism• Changing electr
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All Electromagnetic WavesMove at th
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Radio Waves• Hertz discovered rad
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Infrared Region• Bag is transpare
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Gamma Rays• Produced by very hot
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Atmospheric Opacity• Opacity is t
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Heat or Thermal Energy• The hotte
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Blackbody Radiation• A blackbody
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Wein’s Law• As the temperature
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Blackbody Curve• After attempts b
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Planet Impact?• Star HD172555 has
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Moving Source• Wavelengths in dir
Page 28 and 29: Relative Motion• Stationary obser
Page 30 and 31: Picturesof Atoms• 48 iron atoms o
Page 32 and 33: What’s an Atom?-Nucleus & Electro
Page 34 and 35: Neutrons & Isotopes
Page 37 and 38: Bohr Atom• Tiny positive nucleusc
Page 39 and 40: Photon Emission/Absorption• The e
Page 41 and 42: Electron: is a particle & a wave•
Page 43 and 44: EmissionMatchesAbsorptionSpectrum
Page 45 and 46: PhotonAbsorptionandEmission• Elec
Page 47 and 48: Spectra ofMolecules• Carbon Monox
Page 49 and 50: Annie Jump Cannon• Originated the
Page 51 and 52: Cecilia Payne-Gaposchkin• Found t
Page 53 and 54: Thermal Broadening• Because the a
Page 55 and 56: Pressure/Collisional Broadening•
Page 57 and 58: Discovering Extrasolar Planets• S
Page 60 and 61: Electromagnetic Spectrum• All ele
Page 62 and 63: Energy LevelDiagram of aHydrogen At
Page 64 and 65: Pressure• Gas is made of tiny ato
Page 66 and 67: Relative Radii of Atoms• Atomic r
Page 68 and 69: Time to Solar System Formation• M
Page 70 and 71: Transitions of Hydrogen• Differen
Page 72 and 73: Spectral Sequence = Temperature Seq
Page 74 and 75: Solar Spectrum• Millions of absor
Page 76 and 77: Types of SpectraWe usually look at
Page 80 and 81: Wien’s Law• Wavelength of maxim
Page 82 and 83: Loss ofAtmosphere• First atmosphe
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Visible Spectrum

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