Volume 441, Number 1, October I 2005
|Page(s)||303 - 308|
|Published online||13 September 2005|
A detailed spectroscopy of the carbon-rich star BD +57° 2161
Institute of Atomic Physics and Spectroscopy, University of Latvia, Raiņa bulvāris 19, 1586 Rīga, Latvia e-mail: firstname.lastname@example.org
2 N. Copernicus Astronomical Center, ul. Rabiańska 8, 87-100 Toruń, Poland e-mail: email@example.com
3 Special Astrophysical Observatory and Isaac Newton Institute of Chile, SAO Branch, Nizhnij Arkhyz, 369167, Russia e-mail: firstname.lastname@example.org, email@example.com
4 ICAMER, National Academy of Sciences of Ukraine, 361605 Peak Terskol, Kabardino-Balkaria, Russia
5 Shamakhy Astrophysical Observatory, National Academy of Sciences of Azerbaijan, Azerbaijan
6 Korean Astronomy Observatory, Optical Astronomy Division, 61-1, Whaam-Dong, Yuseong-Gu, Daejon, 305-348, Korea e-mail: firstname.lastname@example.org
7 Vilnius University Observatory, Ciurlionio 29, Vilnius 2009, Lithuania e-mail: email@example.com
Accepted: 9 May 2005
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 dex and a mean s-process overabundance of 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, , 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.
Key words: stars: evolution / stars: atmospheres / stars: abundances / stars: chemically peculiar / stars: individual: BD +57° 2161 / stars: individual: BD +75° 348
© ESO, 2005
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