A study of the supergiant 89 Her |
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Authors: | A M Khalilov Z A Samedov A R Hasanova |
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Institution: | (1) Shamakha Astrophysical Observatory, Azerbaijan National Academy of Sciences, Yu. Mamedaliev settlement, Shamakha district, 373243, Azerbaijan;(2) Baku State University, Baku, Azerbaijan |
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Abstract: | We have used spectrograms taken with a dispersion of 8–12 Å per mm and Kurucz model atmospheres to study the supergiant 89 Her (F2Ibe).We find the effective temperature and gravity T eff = 6300 ± 150 K and log g = 0.5 ± 0.2. We have analyzed the microturbulence in the star’s atmosphere based on FeI, FeII, and TiII lines, deriving ξ t = 7.0 ± 0.5 km/s for the FeI and TiII lines and ξ t = 8.0 ± 0.5 km/s for the FeII lines. Abundances were determined for 23 elements. The elemental abundances in the atmosphere of 89 Her show deficiencies compared to the solar chemical composition, except for sodium, which is overabundant relative to the Sun. |
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