The Probable Quadruple Systems GI CEP and V548 CYG

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Abstract

Orbital-period variations of the eclipsing binaries GI Cep and V548 Cyg are analyzed. The period variations in both systems can be described as a superposition of secular decrease and two cyclic variations of the period. The rate of decrease of the period dP/dt = 3.73 · 10–7 day/year for GI Cep and 2.38 · 10–7 day/year for V548 Cyg. A superposition of two kinds of cyclic variations is observed for GI Cep and V548 Cyg: with periods of 14.4 years and 33.7 years for GI Cep, and 5.4 and 43.8 years for V548 Cyg. The observed cyclic variations in the period of GI Cep can occur due to the presence of a third body in the system or due to the magnetic activity of the secondary component. The system can be triple or quadruple. The hypothesis of magnetic activity is not suitable for V548 Cyg. Apparently, this is quadruple system.

About the authors

A. I. Khaliullina

Sternberg State Astronomical Institute, Lomonosov Moscow State University

Email: hfh@sai.msu.ru
Moscow, Russia

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