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Feh-Duf: very high-velocity low-metallicity star with peculiar chemical abundance

Published online by Cambridge University Press:  09 March 2010

Natalia A. Drake  and
Claudio B. Pereira
Natalia A. Drake
Affiliation:
Sobolev Astronomical Institute, St. Petersburg State University, Universitetski pr. 28, St. Petersburg 198504, Russia email: drake@on.br
Claudio B. Pereira
Affiliation:
Observatório Nacional/MCT, Rua José Cristino, 77, CEP 20921-400, São Cristóvão, Rio de Janeiro, RJ, Brazil email: claudio@on.br
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Abstract

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We present the results of a study of the very high velocity (υrad = +448.0 ± 1.0 kms−1) low-metallicity ([Fe/H] = −1.93) star Feh-Duf ((Fehrenbach & Duflot 1981) showing peculiar chemical abundance. Using high-resolution spectrum, we showed that this star has enhanced carbon and heavy s-process element abundance ([C/Fe] = +0.58, [hs/Fe] = +0.88 dex) while the [Y/Fe] = −0.07 dex). The carbon isotopic ratio is low (12C/13C=8). We found that oxygen abundance is reduced ([O/Fe] = +0.10 dex) as compared with Galactic field stars of a similar metallicity. The evolution state of this star and its possible extragalactic origin are discussed.

Keywords

stars: fundamental parametersstars: abundancesstars: chemically peculiarstars: kinematicsstars: Population II
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 241 - 242
Copyright
Copyright © International Astronomical Union 2010

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