Period–luminosity relation for persistent low-mass X-ray binaries in the near-infrared

Authors

  • Mikhail G. Revnivtsev,

    Corresponding author
    1. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117997 Moscow, Russia
    Search for more papers by this author
  • Ivan Yu. Zolotukhin,

    1. Observatoire de Paris-Meudon, LERMA, UMR 8112, 61 Av. de l’Observatoire, 75014 Paris, France
    2. Sternberg Astronomical Institute, Moscow State University, Universitetskij pr. 13, 119992 Moscow, Russia
    3. Observatoire de Paris, VO–Paris Data Centre, 61 Av. de l’Observatoire, 75014 Paris, France
    Search for more papers by this author
  • Alexander V. Meshcheryakov

    1. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117997 Moscow, Russia
    Search for more papers by this author

E-mail: revnivtsev@iki.rssi.ru

ABSTRACT

We study the 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 the optical and near-infrared spectral energy distributions of LMXBs can be adequately described by a simple model of an accretion disc and a secondary star reprocessing X-ray emission from a central compact object. This gives us evidence that one can make a reliable estimate of the orbital period of a persistent LMXB using an X-ray luminosity and an absolute infrared magnitude. Using a sample of well-known LMXBs, we have constructed a correlation of LX, Porb and MK values that can be approximated by a straight line with root-mean-square scatter at the level of ∼0.3 mag. Such a correlation, being to some extent analogous to the correlation found by van Paradijs & McClintock, might be helpful for future population studies, especially in the light of forthcoming surveys of the Galaxy in the X-ray and infrared spectral domains.

Ancillary