The Chandra Variable Guide Star Catalog, Version 2
Abstract
The Chandra Variable Guide Star Catalog (VGUIDE), Version 2.0 is now complete. The first version of this catalog was published in 2010, including 829 guide star entries identified at optical wavelengths during the first 10 years of the Chandra mission. Of these 587 were classified as definitely variable and 242 suspected to be variable. Of the definite variable star entries, 319 were previously unidentified. Version 2 includes 1347 entries from the first 18 years of the Chandra mission, of which 216 are newly discovered variables. The variable guide stars are identified from light curves from the Aspect Camera onboard Chandra, which is sensitive to 4000-9000 A and has been sufficiently photometrically stable to allow analysis of multiple light curves throughout the mission. Guide stars used for Chandra operations are usually 6th to 10th magnitude and may be observed continuously for up to two days, as well as multiple times. We analyze the properties of the new VGUIDE catalog with respect to spectral type and variable type, and show examples of discovery light curves.
- Publication:
-
American Astronomical Society Meeting Abstracts #235
- Pub Date:
- January 2020
- Bibcode:
- 2020AAS...23530606M