Period--luminosity relation for persistent LMXBs in the near-infrared

Abstract

We study relations between the X-ray luminosity, orbital period and absolute near-infrared magnitude of persistent low-mass X-ray binaries (LMXBs). We show that often optical and near-infrared spectral energy distribution of LMXBs can be adequately described by a simple model of an accretion disc and a secondary star reprocessing X-ray emission of a central compact object. This gives us an evidence that using an X-ray luminosity and an absolute infrared magnitude of a persistent LMXB one can make reliable estimate of its orbital period. Using a sample of well-known LMXBs, we have constructed a correlation of L_X, P_orb and M_K values which can be approximated by a straight line with the RMS scatter at the level of ~0.3 mag. Such a correlation, being to some extent an analogous to the correlation, found by van Paradijs & McClintock 1994, might be helpful for future population studies especially in the light of forthcoming surveys of the Galaxy in X-ray and infrared spectral domains.

9 pages, 6 figures. Accepted for publication in MNRAS

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• Quiescent NIR and optical counterparts to candidate black hole X-ray binaries
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• Sample of optically unidentified X-ray binaries in the Galactic bulge. Constraints on the physical nature from infrared photometric surveys
• On the origin of the near-infrared emission from the neutron-star low-mass X-ray binary GX 9+1
• Optical Identification of Four Hard X-ray Sources from the INTEGRAL Sky Surveys
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