Quasi-periodicity of neutron star binary 4U 1636-536

We studied the low-mass X-ray binary 4U 1636-536, an accreting neutron star, in which the quasi-periodicity of ~45 d was discovered. We interpreted it as resulting from the hydrogen thermal-ionization instability occurring in outer regions of the accretion disc. Results of this study are presented in the article by Mateusz Wiśniewicz et al., submitted to Astronomy and Astrophysics. Link to the preprint of this article is here.Below is an artistic picture of a binary system that we studied.

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