Abstract

The variations in the orbital period of the eclipsing binary system V505 Sgr, which is a part of the visual binary system CHR 90, have been analyzed. It has been shown that the variations in the period can be represented as a superposition of the secular decrease in the period at a rate of 2.97 × 10^–7 days/year and the light-time effect with a period of 72.8 years. The secular decrease in the period can be explained by the loss of angular momentum due to magnetic braking on the secondary component of a late spectral type. The light-time effect is explained by the presence of a third body in the system, which was discovered from both spectral and speckle interferometric observations.

中文翻译：

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渐进二元系统V505 Sgr的轨道周期变化

摘要

已经分析了作为视觉二进制系统CHR 90的一部分的日食二进制系统V505 Sgr的轨道周期变化。研究表明，周期的变化可以表示为周期内长期下降的叠加，周期为2.97×10 ^–7天/年，光周期为72.8年。周期中的长期减少可以用后期频谱类型的次级分量上的磁制动导致的角动量损失来解释。系统中存在第三体可以解释光时效应，这是从光谱和散斑干涉测量观察中发现的。