Photometric Calibration and Bright Variables in the Chandra Galactic Bulge Survey

Details Photometric Calibration and Bright Variables in the Chandra Galactic Bulge Survey Photometric Calibration and Bright Variables in the Chandra Galactic Bulge Survey

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011noao.prop..432b&link_type=abstract

NOAO Proposal ID #2011A-0432

Physics

Scientific paper

The Galactic Bulge Survey has identified ~1700 faint X-ray sources in the Galactic Bulge. As the fields lie above and below the main body of Galactic plane extinction, these objects are also accessible optically. Approximately 1200 have identified optical counterparts with a manageable degree of crowding. We expect most to be interacting binaries including 400 mostly quiescent low-mass X-ray binaries. We have obtained time-resolved optical photometry of these objects using Mosaic-II in order to measure orbital periods and identify high inclination, especially eclipsing, objects. We propose to observe standards with the Y4KCam on the CTIO 1.0m to calibrate magnitudes of stars we have observed with Mosaic-II. Additionally, 238 candidate sources were bright enough to saturate on the Mosaic-II run, so using the wide field of view on the Y4KCam will be an ideal opportunity to recover variability in the optically bright end of the population, removing a selection effect against bright objects and allowing us to perform useful observations in non-photometric time. There is an excellent likelihood that this project will lead to identification of the first dynamically confirmed Galactic eclipsing black hole binary.

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