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Astron. Astrophys. 358, 1022-1026 (2000)

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A carbon rich star BD +75o 348: a binary?

L. Zas 1, M.R. Schmidt 2 and W.J. Schuster 3

1 Ventspils International Radio Astronomy Center, Akadmijas laukums 1, 1050 Riga, Latvia
2 N. Copernicus Astronomical Center, ul. Rabiaska 8, 87-100 Toru, Poland
3 Observatorio Astronomico Nacional, UNAM, Apartado Postal 877, C.P. 22800 Ensenada, B.C., Mexico

Received 16 February 2000 / Accepted 22 April 2000

Abstract

An LTE abundance analysis of the "CH-like" star BD [FORMULA] 348, with an unknown evolutionary status, is presented based on high resolution, high signal-to-noise spectra. With [C/Fe] = +0.5 dex and a mean s-process overabundance of [s/Fe] [FORMULA] dex the peculiar atmospheric composition of BD [FORMULA] 348 is confirmed. The modest iron deficiency, [Fe/H] = -0.8, and the kinematic data support the idea that BD [FORMULA] 348 is an old disk population object. Possible evolutionary stages, that can explain its atmospheric parameters and peculiar chemical composition, are discussed.

Key words: stars: evolution – stars: abundances – stars: chemically peculiar – stars: individual: O  348

Send offprint requests to: L. Zas (zacs@latnet.lv)

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© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000
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