Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-05-14
Astronomy and Astrophysics
Astrophysics
3 pages, no figure, to appear in: Proc. of the 26th workshop of the European Working Group on CP stars, eds. P. North, A. Schn
Scientific paper
Seven high-resolution and high S/N CCD spectra were used to derive elemental abundances in the atmosphere of VW Ari A (T_eff=7200, log g=3.7) which is the primary component of a visual binary system. The synthetic spectrum technique applied in the analysis allowed to reveal the following feature: the atmosphere of this star is strongly deficient in some metals, while light elements have solar-like abundances. Taking into account these results, one can suggest that VW Ari A is a lambda Boo-type star. Another argument supporting this supposition is the following: on the diagrams (b-y)-c_1, (b-y)-m_1 and (b-y)-beta (Paunzen et al. 1997), VW Ari A falls exactly in the region occupied by the lambda Boo stars. Note also, that a previous analysis (Andrievsky et al. 1995) has shown that the secondary component of VW Ari has a normal metallicity. Differences in chemical compositions of the two components appear to be due to the specific evolution of the primary VW Ari A.
Andrievsky Sergei. M.
Chernyshova I. V.
Kovtyukh Valery V.
Mkrtichian David. E.
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