Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.170n&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Other
Source Catalogs, Software
Scientific paper
Variable stars have been identified among the optical-wavelength lightcurves of guide stars used for pointing control of the Chandra X-ray Observatory. We present a catalog of these variable stars along with their light curves and ancillary data. Variability was detected to a lower limit of 0.03 mag in the 4000-9000 A range using the photometrically stable Aspect Camera onboard the Chandra spacecraft. The Chandra Variable Guide Star Catalog contains more than 900 objects, of which we believe at least 500 are new detections of variable stars. Types of variables in the catalog include eclipsing binaries, pulsating stars, and rotating stars. The variability was detected during the course of normal verification of each Chandra pointing and results from analysis of 75,200 guide star light curves from the entire Chandra mission. Since many guide stars were used for multiple observations, a significant number of the stars in the catalog have multiple light curves available from various times over the last 10 years. The search for variable stars continues as the Chandra mission proceeds. Supplements to the catalog will be published and added to the web interface. The Chandra Variable Guide Star Catalog is a unique project using otherwise discarded information collected during the mission.
Huenemoerder Dave
Lauer Jennifer
Martin Eduardo
Morgan Daniel
Nichols Jonathan
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