Variations in the orbital periods of eclipsing binaries δ Lib and SX Lyn

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Аннотация

Variations in the orbital period of eclipsing binaries δ Lib and SX Lyn are studied. It is shown that these variations can be represented with equal accuracy in two ways: either in the form of a superposition of secular decrease and cyclic variations or only in the form of cyclic fluctuations. Cyclic variations in the period of δ Lib in both cases can be due to the presence of a third body in the system. In the case of a quadratic representation, they can be also a consequence of the magnetic activity of the secondary component. For SX Lyn a superposition of two cyclic variations is found for both linear and quadratic representation. The lower-period variations in both cases can be due to the presence of a third body in the system. The longer-period variation can be a consequence of the magnetic activity of the secondary component. The secular decrease in the periods of both systems could be due to a loss of angular momentum due to magnetic braking.

Негізгі сөздер

Авторлар туралы

A. Khaliullina

Sternberg State Astronomical Institute, Lomonosov Moscow State University

Хат алмасуға жауапты Автор.
Email: hfh@sai.msu.ru
Ресей, Moscow

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