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X-ray binaries with neutron stars at different accretion stages

Published online by Cambridge University Press:  30 December 2019

Konstantin A. Postnov ,
Alexander G. Kuranov  and
Lev R. Yungelson
Konstantin A. Postnov
Affiliation:
Sternberg Astronomical Institute, Moscow M.V. Lomonosov State University 13 Universitetskij pr., 119234 Moscow, Russia email: pk@sai.msu.ru Kazan Federal University, 18 Kremlyovskaya str., 420008 Kazan, Russia
Alexander G. Kuranov
Affiliation:
Sternberg Astronomical Institute, Moscow M.V. Lomonosov State University 13 Universitetskij pr., 119234 Moscow, Russia email: pk@sai.msu.ru Russian Foreign Trade Academy, 4 Pudovkin str., 119285 Moscow, Russia
Lev R. Yungelson
Affiliation:
Institute of Astronomy, RAS, 48 Pyatnitskaya str., 119017 Moscow, Russia email: lry@inasan.ru
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Abstract

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. Different accretion regimes onto magnetized NSs in HMXBs are considered: wind-fed supersonic (Bondi) regime at high accretion rates <math/> g s-1, subsonic settling regime at lower <math/> and supercritical disc accretion during Roche lobe overflow. In wind-fed stage, NSs in HMXBs reach equilibrium spin periods P* proportional to binary orbital period Pb. At supercritical accretion stage, the system may appear as a pulsating ULX. Population synthesis of Galactic HMXBs using standard assumptions on the binary evolution and NS formation is presented. Comparison of the model P* – Pb (the Corbet diagram), P* – Lx and Pb – Lx distributions with those for the observed HMXBs (including Be X-ray binaries) and pulsating ULXs suggests the importance of the reduction of P* in non-circular orbits, explaining the location of Be X-ray binaries in the model Corbet diagram, and the universal parameters of pulsating ULXs depending only on the NS magnetic fields.

Keywords

accretionaccretion disksbinaries: closestars: neutron
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 219 - 227
Copyright
© International Astronomical Union 2019 

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