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26 April 2024

» arxiv » 1905.8107

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Constraining the nature of the accreting binary in CXOGBS J174623.5-310550
M. A. P. Torres ; S. Repetto ; T. Wevers ; M. Heida ; P. G. Jonker ; R. I. Hynes ; G. Nelemans ; Z. Kostrzewa-Rutkowska ; L. Wyrzykowski ; C. T. Britt ; C. O. Heinke ; J. Casares ; C. B. Johnson ; T. J. Maccarone ; D. T. H. Steeghs ;
Date:	20 May 2019
Abstract:	We report optical and infrared observations of the X-ray source CXOGBS J174623.5-310550. This Galactic object was identified as a potential quiescent low-mass X-ray binary accreting from an M-type donor on the basis of optical spectroscopy and the broad Halpha emission line. The analysis of X-shooter spectroscopy covering 3 consecutive nights supports an M2/3-type spectral classification. Neither radial velocity variations nor rotational broadening is detected in the photospheric lines. No periodic variability is found in I- and r’-band light curves. We derive r’ = 20.8, I = 19.2 and Ks = 16.6 for the optical and infrared counterparts with the M-type star contributing 90% to the I-band light. We estimate its distance to be 1.3-1.8 kpc. The lack of radial velocity variations implies that the M-type star is not the donor star in the X-ray binary. This could be an interloper or the outer body in a hierarchical triple. We constrain the accreting binary to be a < 2.2 hr orbital period eclipsing cataclysmic variable or a low-mass X-ray binary lying in the foreground of the Galactic Bulge.
Source:	arXiv, 1905.8107
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