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Variability of optical counterparts in the Chandragalactic bulge survey
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Britt, C. T., Hynes, R. I., Johnson, C. B., Baldwin, A., Jonker, P. G., Nelemans, G., Torres, M. A. P., Maccarone, T., Steeghs, D., Greiss, Sandra, Heinke, C., Bassa, C. G., Collazzi, A., Villar, A., Gabb, M. and Gossen, L. (2014) Variability of optical counterparts in the Chandragalactic bulge survey. The Astrophysical Journal Supplement Series, Volume 214 (Number 1). Article number 10. doi:10.1088/0067-0049/214/1/10 ISSN 0067-0049.
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Official URL: http://dx.doi.org/10.1088/0067-0049/214/1/10
Abstract
We present optical light curves of variable stars consistent with the positions of X-ray sources identified with the Chandra X-ray Observatory for the Chandra Galactic Bulge Survey (GBS). Using data from the Mosaic-II instrument on the Blanco 4 m Telescope at CTIO, we gathered time-resolved photometric data on timescales from ~2 hr to 8 days over the 3/4 of the X-ray survey containing sources from the initial GBS catalog. Among the light curve morphologies we identify are flickering in interacting binaries, eclipsing sources, dwarf nova outbursts, ellipsoidal variations, long period variables, spotted stars, and flare stars. Eighty-seven percent of X-ray sources have at least one potential optical counterpart. Twenty-seven percent of these candidate counterparts are detectably variable; a much greater fraction than expected for randomly selected field stars, which suggests that most of these variables are real counterparts. We discuss individual sources of interest, provide variability information on candidate counterparts, and discuss the characteristics of the variable population.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Journal or Publication Title: | The Astrophysical Journal Supplement Series | ||||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||||
ISSN: | 0067-0049 | ||||||||
Official Date: | 3 September 2014 | ||||||||
Dates: |
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Volume: | Volume 214 | ||||||||
Number: | Number 1 | ||||||||
Article Number: | Article number 10 | ||||||||
DOI: | 10.1088/0067-0049/214/1/10 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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