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Radial Velocity Variations of the Hα and NaI D Lines for the High-Latitude Supergiant Star 89 Her

Khalilov A. M., Hajiyeva G. M., Hasanova A. R., Hasanova A. B.

Acta Astronomica

2022

Vol. 72, No. 4

297--313

The variations in the spectral parameters of the Hα and sodium doublet NaI D lines 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 between 1975 and 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 Hα and sodium doublet NaI D line's radial velocity and the equivalent width of the absorption component vary with a period of 5000 d. The orbital elements of the binary system were determined for the first time within the spectroscopic-binary system model.