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

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We report optical and infrared observations of theX-ray source CXOGBS J174623.5.310550. This Galactic object was identified as a potential quiescent low-mass X-ray binary accreting from anM-type donor on the basis of optical spectroscopy and the broadHα emission line. The analysis of X-shooter spectroscopy covering three 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 per cent 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 h orbital period eclipsing cataclysmic variable or a low-mass X-ray binary lying in the foreground of the Galactic bulge.

Original languageEnglish
Pages (from-to)2296-2306
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Aug 1 2019


  • Binaries: close
  • Stars: individual: CXOGBS J174623.5-310550
  • X-rays: binaries


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