6533b859fe1ef96bd12b761a
RESEARCH PRODUCT
A detailed spectroscopy of the carbon-rich star BD +57° 2161
G. A. GalazutdinovLaimons ZačsJulius SperauskasF. A. MusaevF. A. MusaevF. A. MusaevM. R. Schmidtsubject
PhysicsRadial velocitySpace and Planetary ScienceAsymptotic giant branchAstronomy and AstrophysicsAstrophysicsSpectroscopys-processStellar evolutionChemical compositionCarbon starSpectral linedescription
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 12 C/ 13 C 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-09-13 | Astronomy & Astrophysics |