Journal Article

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

Mikhail G. Revnivtsev, Ivan Yu. Zolotukhin and Alexander V. Meshcheryakov

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 4, pages 2846-2853
Published in print April 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20511.x
Period–luminosity relation for persistent low‐mass X‐ray binaries in the near‐infrared

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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.

Keywords: infrared: stars; X‐rays: binaries

Journal Article.  5246 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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