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Abstract <p>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 d<i>P</i>/d<i>t</i> = 3.73 × 10<sup>–7</sup> day/yr for GI Cep and 2.38 × 10<sup>–7</sup> day/yr for V548 Cyg. A superposition of two types of cyclic variations is observed for GI Cep and V548 Cyg: with periods 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.</p>

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The Probable Quadruple Systems GI Cep and V548 Cyg

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • A. I. Khaliullina

摘要

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/yr for GI Cep and 2.38 × 10–7 day/yr for V548 Cyg. A superposition of two types of cyclic variations is observed for GI Cep and V548 Cyg: with periods 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.