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Astron. Astrophys. 321, 838-840 (1997)


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Research Note

On the possible origin of [FORMULA] Boo stars

S.M. Andrievsky

Department of Astronomy, Odessa State University, Shevchenko Park, 270014 Odessa, Ukraine

Received 12 March 1996 / Accepted 6 September 1996

Abstract

We discuss a new approach to the problem of the origin of [FORMULA] Boo stars. It is proposed that at least some of these stars may arise from contact binary systems of W UMa type. Simple estimations based on this supposition can account for the present-day number of [FORMULA] Boo stars in the solar neighbourhood, their masses and spectral classes. It is also important that the proposed scenario does not exclude circumstellar shell formation, which is responsible for the chemical peculiarities of [FORMULA] Boo stars.

Key words: stars: binaries; close – stars: chemically peculiar – stars: evolution


© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998

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