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The atmosphere of hypergiant ? Cas is investigated by the method of atmospheric model. Effective temperature and the surface of gravity are determined by comparing the observed and theoretical values of photometrical indices [c1];Q, and equivalent widths of Balmer lines: Teff = 5450?200K, log g=0:1?0:2. The microturbulence parameter is evaluated as ?t = 10?1 km/s, based on studies of FeII lines. The chemical composition of the star is determined. In the atmosphere of ? Cas the C turned out to be a deficit, N, and Na in excess, other investigated elements practically display solar abundance.
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Samedov et al. (2024) studied this question.
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