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Cyclical Changes in the Extraeclipse Brightness and the Period of W UMa-TYPE Close Binary System AM Leo

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Abstract

The results of 14-year photometric monitoring of the contact close binary system (CBS) W UMa-type AM Leo are presented. Low-amplitude cyclic variations in brightness with a period of \(7.6 \pm 0.3\) years, not associated with the phenomena of eclipses and tidal deformations of the components, as well as low-amplitude cyclic variations of the CBS period with practically the same value of the oscillation period, were found. It is concluded that the mechanism generating such oscillations may be the process of changing the magnetic field of the convective shells of the components. Based on the detected decrease in the depths of both minima of the light curves and the change in their relative values, it was concluded that the system is currently transiting from the W-subtype class to the A-subtype class. The values of seven new values of the moments of minima are given.

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Funding

This work was supported by the Ministry of Education and Science of the Russian Federation within the framework of the research activities (project no. FEUZ-2020-0030), as well as Decree 211 of the Government of the Russian Federation (contract no. 02.A03.21.0006).

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Authors and Affiliations

  1. Kourovka Astronomical Observatory, Ural Federal University, 620000, Yekaterinburg, Russia

    S. Yu. Gorda

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Correspondence to S. Yu. Gorda.

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Translated by E. Seifina

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Gorda, S.Y. Cyclical Changes in the Extraeclipse Brightness and the Period of W UMa-TYPE Close Binary System AM Leo. Astron. Rep. 64, 922–935 (2020). https://doi.org/10.1134/S1063772920110037

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