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Hot spot drift in synchronous and asynchronous polars: synthesis of light curves

Published online by Cambridge University Press:  20 January 2023

Andrey Sobolev Open the ORCID record for Andrey Sobolev [Opens in a new window] ,
Dmitry Bisikalo  and
Andrey Zhilkin Open the ORCID record for Andrey Zhilkin [Opens in a new window]
Andrey Sobolev*
Affiliation:
Institute of astronomy of the Russian academy of sciences, 119017, Pyatnitskaya st., 48, Moscow, Russia
Dmitry Bisikalo
Affiliation:
Institute of astronomy of the Russian academy of sciences, 119017, Pyatnitskaya st., 48, Moscow, Russia
Andrey Zhilkin
Affiliation:
Institute of astronomy of the Russian academy of sciences, 119017, Pyatnitskaya st., 48, Moscow, Russia
*
email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

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In this paper, the effect of hot spots movement by accretor surface on the appearance of bolometric light curves for two types of polars - synchronous V808 Aur and asynchronous CD Ind is studied. The analysis was carried out under the assumption of a dipole configuration of the magnetic field, in which the axis of the dipole passes through the accretor center. It is shown that a noticeable shift of the flow maximum at the light curve corresponding to the position of the spots in synchronous polars is determined by a change in the magnitude of mass transfer rate. At the same time, the maximum deviation of the spots from the magnetic poles was 30°. In asynchronous polars, assuming a constant of the mass transfer rate, the spots movement caused by a change in the orientation of the dipole axis relative to the donor has a significant effect on the appearance of light curve. The greatest displacement of the spots from the magnetic poles, which equals to 20°, was observed at the moments when the accretion jet switched from one pole to the other. It is concluded that the comparison of synthetic and observational light curves provides an opportunity to study the physical properties of polars.

Keywords

close binary starpolarMHDflow structuredonoraccretorhot spottemperature map
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S362: The Predictive Power of Computational Astrophysics as a Discovery Tool , June 2020 , pp. 228 - 233
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

Bisikalo, D. Sobolev, A. Zhilkin, A. “Hot Spots Drift in Synchronous and Asynchronous Polars: Results of Three-Dimensional Numerical Simulation.” Galaxies, 2021, Vol. 9, No. 4, p.110.10.3390/galaxies9040110CrossRefGoogle Scholar
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Sobolev, A., Zhilkin, A. 2019, Method of constracting a synthetic light curve for eclipsed polars; INASAN Proceedings, 3, p. 231.Google Scholar