Abstract

The variations in the spectral parameters of the sodium doublet Na I D line of the high-latitude supergiant 89 Her were investigated on the basis of the spectrograms obtained at the 2-m telescope of Shamakhy Astrophysical Observatory for 1975–2017. The research has shown that, in addition to shorter periodic changes, which were found earlier by various authors, there are also long-period changes in the atmosphere of this star. It has been found that the sodium doublet Na I D line’s radial velocity of the absorption component varies with a period of 5000 days. The orbital elements of the binary system were determined for the first time within the spectral-binary system model.

中文翻译：

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高纬度超级巨星89 Her的Na ID线的径向速度变化

摘要

根据1975-2017年Shamakhy天体观测台2米望远镜获得的光谱图，研究了高纬度超级巨星89 Her的钠双峰Na ID谱线的光谱参数变化。研究表明，除了各种作者较早发现的较短的周期性变化外，该恒星的大气层还存在长周期变化。已经发现，二重钠Na ID线的吸收成分的径向速度每隔5000天变化一次。在光谱-二进制系统模型中，首次确定了二进制系统的轨道元素。