star pdf file

20030025398 NASA Goddard Space Flight Center, Greenbelt, MD, USA
Strategies for Studying the Sources of Gamma Ray Bursts
Cline, T. L.; Norris, J. P.; Hurley, K. C.; February 20, 2003; 1 pp.; In English; No Copyright; Avail: Other Sources; Abstract
Only
The study of gamma ray bursts (GRBs) has rapidly evolved in recent years with the discovery of their cosmological nature
and with BATSE, BeppoSAX, HETE and the IPN enabling a wide variety of associated . afterglow measurements.
Multiwavelength observations ranging through the radio, optical, soft and hard x-ray, and gamma-ray regimes have exploded
the field of GRB interpretation. Also, the Amanda, Milagro and LIGO experiments can search for related neutrino, cosmic-ray
photon, and gravitational radiation events, even with the delayed alerts, such as from the IPN. The infrared region, where the
optical emissions from sources at the extreme distances may be shifted, will become important but is undersubscribed. The
soon-to-be launched Swift mission will greatly broaden the GRB discipline, and a strategy for associated ground-based
measurements is outlined. The need for the improved global distribution of all instruments, in particular, robotic infrared
detectors, is cited.
Author
Gamma Ray Bursts; Afterglows; Laser Interferometry; Infrared Detectors; Gravitational Waves
20030025737 NASA Goddard Space Flight Center, Greenbelt, MD, USA
New Pulsars from Arecibo Drift Scan Searches
McLaughlin, M. A.; Lorimer, D. R.; Arzoumanian, Z.; Backer, D. C.; Cordes, J. M.; Fruchter, A.; Lommen, A. N.; Xilouris,
K.; [2003]; 4 pp.; In English; Copyright; Avail: CASI; A01, Hardcopy
We report new pulsars discovered in drift-scan data taken by two collaborations (Berkeley/Cornell and STScI/NAIC)
during the latter stages of the Arecibo upgrade period. The data were taken with the Penn State Pulsar Machine and are being
processed on the COBRA cluster at Jodrell Bank. Processing is roughly 70\% complete and has resulted in the detection of
10 new and 31 known pulsars, in addition to a number of pulsar candidates. The 10 new pulsars include one pulsar with a
spin-period of 55 ms and another with a spin period of 5.8 ms. At the completion of the processing, we expect to have
discovered roughly 20 new pulsars. All new pulsars are being subjected to a program of followup observations at Arecibo to
determine spin and astrometric parameters.
Author
Sky Surveys (Astronomy); Pulsars; Data Processing; Radio Astronomy
20030025742 NASA Goddard Space Flight Center, Greenbelt, MD, USA
Two Types of Soft X-ray Spectra in Cataclysmic Variables
White, Nicholas E., Technical Monitor; Mukai, K.; Kinkhabwala, A.; Peterson, J. R.; Kahn, S. M.; Paerels, F.; [2002]; 13 pp.;
In English; Copyright; Avail: CASI; A03, Hardcopy
We present results of analyses of Chandra HETG soft X-ray spectra (Lambda = 1.5-25 A) of seven cataclysmic variables.
We find that these spectra divide unambiguously into two distinct types. Spectra of the first type, consisting of EX Hya, V603
Aql, U Gem, and SS Cyg, are remarkably well fit by a simple cooling flow model, which assumes only steady-state isobaric
radiative cooling. This model has only two free parameters, the maximum temperature, kT(sub max), which provides a rough
measurement of the depth of the potential well, and the overall normalization, which provides a highly precise measurement
of the total accretion rate. Spectra of the second type, consisting of V1223 Sgr, A Psc, and GK Per, are grossly inconsistent
with a simple cooling flow model. They instead exhibit a hard continuum, and, in addition, show strong H-like and He-like
ion emission but little Fe L-shell emission, which is consistent with expectations for line emission from a photoionized plasma.
Using a simple photoionization model, we argue that the observed line emission for these sources can be driven entirely by
the hard continuum. The physical significance of these two distinct types of X-ray spectra is also explored.
Author
X Ray Spectra; X Ray Stars; Cataclysmic Variables; Binary Stars; Ion Emission; Photoionization
20030031375 NASA Goddard Space Flight Center, Greenbelt, MD, USA
The -145 km/s Absorption System of Eta Carinae
Vieira, G.; Gull, Theodore R.; Danks, A.; Johansson, S.; [2002]; 2 pp.; In English; AAS 201st Meeting, 5 Jan. 2003, Seattle,
WA, USA; No Copyright; Avail: Other Sources; Abstract Only
With the STIS E230H mode (R approx. 118,000), we have identified about twenty absorption components in line of sight
from Eta Carinae. Two components, one at -513 km/s and another at -145 km/s, are quite different in character from the others,
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