Abstract
The Kepler satellite has observed more than eight hundred close binary systems [1], for which it was possible to measure not only the orbital periods, but also the rotation velocities of the stars. It turned out that many stars in close binaries are not synchronized, i.e., the rotation period of the star is not exactly equal to the orbital period. The paper considers two models that can explain the asynchrony of stars: either due to the differential rotation of the star or due to the nonzero eccentricity of the binary system. A numerical simulation of the star’s evolution in a binary system is carried out, considering the inverse effect of a companion on the star, depending on the orbital parameters, and it is shown that a close binary system can be not only in a synchronized, but also in an unsynchronized state during the lifetime of the star on the main sequence. This model is applied to the KIC 8736245 system.
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Funding
This work was (partially) supported by the Russian Foundation for Basic Research, project no. 19-02-00199. The author is grateful to the Government of the Russian Federation and the Ministry of Higher Education and Science of the Russian Federation for their support (project no. 075-15-2020-780 (N13.1902.21.0039)).
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Chernov, S.V. Asynchronous Stars in Close Binary Systems. Astron. Rep. 65, 657–675 (2021). https://doi.org/10.1134/S106377292109002X
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DOI: https://doi.org/10.1134/S106377292109002X