EDP Sciences
Free Access
Volume 441, Number 1, October I 2005
Page(s) 303 - 308
Section Stellar atmospheres
DOI https://doi.org/10.1051/0004-6361:20042417

A&A 441, 303-308 (2005)
DOI: 10.1051/0004-6361:20042417

A detailed spectroscopy of the carbon-rich star BD +57$^{\circ}$ 2161

L. Zacs1, M. R. Schmidt2, F. A. Musaev3, 4, 5, G. A. Galazutdinov6, 3 and J. Sperauskas7

1  Institute of Atomic Physics and Spectroscopy, University of Latvia, Raina bulvaris 19, 1586 Riga, Latvia
    e-mail: zacs@latnet.lv
2  N. Copernicus Astronomical Center, ul. Rabianska 8, 87-100 Torun, Poland
    e-mail: schmidt@ncac.torun.pl
3  Special Astrophysical Observatory and Isaac Newton Institute of Chile, SAO Branch, Nizhnij Arkhyz, 369167, Russia
    e-mail: faig@sao.ru, gala@sao.ru
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: gala@boao.re.kr
7  Vilnius University Observatory, Ciurlionio 29, Vilnius 2009, Lithuania
    e-mail: julius.sperauskas@ff.vu.lt

(Received 23 November 2004 / Accepted 9 May 2005 )

An LTE abundance analysis based on high-resolution spectra is presented for the carbon-rich star BD $+57^{\circ}$ 2161, whose evolutionary status is unknown. With $\rm [C/Fe] =+0.4$ dex and a mean s-process overabundance of $\rm [s/Fe] \simeq +1.5$ dex the peculiar atmospheric composition of BD $+57^{\circ}$ 2161 is confirmed. The 12C/13C abundance ratio was found to be about 10. The mild iron deficiency, $\rm [Fe/H] = -0.2$, supports the idea that BD $+57^{\circ}$ 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 $+75^{\circ}$ 348.

Key words: stars: evolution -- stars: atmospheres -- stars: abundances -- stars: chemically peculiar -- stars: individual: BD $+57^{\circ}$ 2161 -- stars: individual: BD $+75^{\circ}$ 348

SIMBAD Objects

© ESO 2005

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.