The radial velocity variations of the Na I D lines for the high-latitude supergiant star 89 Her

1Khalilov, AM, 1Hasanova, AR, 1Hajiyeva, GM
1Nasir al-Din al-Tusi Shamakhi Astrophysical Observatory, Pirqulu, Azerbaijan
Kinemat. fiz. nebesnyh tel (Online) 2019, 35(3):67-80
Start Page: Physics of Stars and Interstellar Medium
Language: Russian

On the basis of the spectrograms obtained on the 2-m telescope of the Shamakhy Astrophysical Observatory for 1975—2017 variation of spectral parameters of the sodium doublet Na I D lines of the high-latitude supergiant 89 Her were investigated. Researches showed that in the atmosphere of this star except the shorter periodic changes which was found in earlier by different authors there are also long-period changes. It is found that the radial velocity of the absorption component of the sodium doublet Na I D lines is changing with the period of 5000 days. In the framework of spectral-binary system model a spectroscopic elements of the binary system firstly was determined.

Keywords: equivalent width, radial velocities, sodium doublet Na I D lines

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