The investigation of the atmosphere of the mercury-manganese star α And.

A model atmosphere analysis of the chemically peculiar star α And was carried out basing on 7 spectrograms with 2.4 Å/mm dispersion. The effective temperature T_eff = 13700±500K and surface gravity lg g = 3.75±0.25 were determined. The analysis of the chemical composition was made for the comparison by two different model atmospheres. It is noted, that the discrepancy in T_eff values inferred from the energy distribution in the visual region and from the ionization equilibrium might be a consequence of the binary nature of the star. The parameters of the components and some orbital elements are roughly estimated.