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.
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ACKNOWLEDGMENTS
We would like to thank Prof. N.Z. Ismailov for the valuable comments and advice.
Funding
This study was funded by the Science Development Foundation under the president of the Republic of Azerbaijan, grant no. ЕIF-BGM-4-RFTF-1/2017-21/07/1.
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Translated by M. Chubarova
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Khalilov, A.M., Hasanova, A.R. & Hajiyeva, G.M. Radial Velocity Variations of the Na I D Lines for the High-Latitude Supergiant Star 89 Her. Kinemat. Phys. Celest. Bodies 35, 143–151 (2019). https://doi.org/10.3103/S0884591319030024
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DOI: https://doi.org/10.3103/S0884591319030024