A detailed spectroscopy of the carbon-rich star BD +57°2161

Details A detailed spectroscopy of the carbon-rich star BD +57°2161 A detailed spectroscopy of the carbon-rich star BD +57°2161

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...441..303z&link_type=abstract

Astronomy and Astrophysics, Volume 441, Issue 1, October I 2005, pp.303-308

Astronomy and Astrophysics

Astrophysics

7

Stars: Evolution, Stars: Atmospheres, Stars: Abundances, Stars: Chemically Peculiar, Stars: Individual: Bd +57&Deg, 2161, Stars: Individual: Bd +75&Deg, 348

Scientific paper

An LTE abundance analysis based on high-resolution spectra is presented for the carbon-rich star BD +57°2161, whose evolutionary status is unknown. With [C/Fe] =+0.4 dex and a mean s-process overabundance of [s/Fe] ≃ +1.5 dex the peculiar atmospheric composition of BD +57°2161 is confirmed. The 12C/13C abundance ratio was found to be about 10. The mild iron deficiency, [Fe/H] = -0.2, supports the idea that BD +57°2161 could be an old-disk-population object. Radial-velocity measurements confirm the binary nature of the star. Therefore the peculiar chemical composition could be due to the mass transfer from the secondary - AGB star in the past. Orbital parameters are estimated for another star of this group, BD +75°348.

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