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Identification of 23 accreting binaries in the Galactic Bulge Survey
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Torres, M. A. P., Jonker, P. G., Britt, C. T., Johnson, C. B., Hynes, R. I., Greiss, Sandra, Steeghs, D., Maccarone, T. J., Ozel, F., Bassa, C. and Nelemans, G. (2014) Identification of 23 accreting binaries in the Galactic Bulge Survey. Monthly Notices of the Royal Astronomical Society, Volume 440 (Number 1). pp. 365-386. doi:10.1093/mnras/stu170 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stu170
Abstract
We present the identification of optical counterparts to 23 GBS X-ray sources. All sources are classified as accreting binaries according to the emission-line characteristics inferred from medium-resolution spectroscopy. To distinguish accreting binaries from chromospherically active objects, we develop criteria based on Hα and He i λλ5786, 6678 emission-line properties available in the literature. The spectroscopic properties and photometric variability of each object is discussed and a classification is given where possible. At least 12 of the 23 systems show an accretion-dominated optical spectrum and another 6 show stellar absorption features in addition to emission lines indicating that they are probably accreting binaries in quiescence or in a low accretion rate state. Two sources are confirmed to be eclipsing: CX207 and CX794. CX207 is likely a magnetic cataclysmic variable (CV), while CX794 is a nova-like CV in the period gap. Finally, the large broadening (2100 km s−1 FWHM) of the Hα emission lines in CX446 and CX1004 suggests that they are also high-inclination or even eclipsing systems. Whether the compact object is a white dwarf in an eclipsing CV, a neutron star or a black hole in a high-inclination low-mass X-ray binary remains to be established.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
Publisher: | Oxford University Press | ||||||||||
ISSN: | 0035-8711 | ||||||||||
Official Date: | 1 May 2014 | ||||||||||
Dates: |
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Volume: | Volume 440 | ||||||||||
Number: | Number 1 | ||||||||||
Page Range: | pp. 365-386 | ||||||||||
DOI: | 10.1093/mnras/stu170 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access |
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