Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-06-18
Astron.Rep.53:232-242,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
26 pages, 3 tables, 13 figures
Scientific paper
10.1134/S1063772909030056
We have analyzed the observed radial-velocity curve for the X-ray binary M33 X-7 in a Roche model. We have analyzed the dependence between the component masses and the degree of filling of the optical star's Roche lobe to obtain the ratio of the masses of the optical star and compact object. For the most probable mass of the optical star, $m_v=70M_{\odot}$, the mass of the compact object is $m_x=15.55\pm3.20 M_{\odot}$. It has been shown that black holes with masses of $m_x=15M_{\odot}$ and even higher can form in binaries. We present characteristic evolutionary tracks for binary systems passing through an evolutionary stage with properties similar to M33 X-7 - type objects. According to population-synthesis analyses, such binaries should be present in galaxies with masses of at least $10^{11}M_{\odot}$. The present number of such systems in M33 should be of the order of unity. We have also studied the evolutionary status of the X-ray binary IC 10 X-1 with a Wolf-Rayet component, which may contain a massive black hole. The final stages of the evolution of the M33 X-7 and IC 10 X-1 systems should be accompanied by the radiation of gravitational waves.
Abubekerov M. K.
Antokhina Eh. A.
Bogomazov Alexey I.
Cherepashchuk Anatol M.
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