High-resolution spectroscopic observations of two chemically peculiar metal-poor stars: HD 10613 and BD+04°2466

Details High-resolution spectroscopic observations of two chemically peculiar metal-poor stars: HD 10613 and BD+04°2466 High-resolution spectroscopic observations of two chemically peculiar metal-poor stars: HD 10613 and BD+04°2466

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...496..791p&link_type=abstract

Astronomy and Astrophysics, Volume 496, Issue 3, 2009, pp.791-804

Astronomy and Astrophysics

Astrophysics

10

Stars: Abundances, Stars: Chemically Peculiar, Stars: Binaries: General

Scientific paper

Aims: We determined the atmospheric parameters and abundance pattern of two chemically peculiar metal-poor stars: HD 10613 and BD+04°2466 in order to better understand their evolutionary state and the nature of the s-element enhancement of these stars. Methods: We used high resolution optical spectroscopy. Atmospheric parameters and abundances were determined in the local-thermodynamic-equilibrium model atmospheres of Kurucz using the spectral analysis code MOOG. Results: We conclude that HD 10613 is another metal-poor barium star with C/O = 0.52 and [Fe/H] = -0.82, while BD+04°2466 is a CH star with C/O = 3.6 and [Fe/H] = -1.92 rather than a metal-deficient barium star as it was previously classified. BD+04°2466 appears to be enriched in lead with [Pb/Ce] = +0.85 and [Pb/La] = +0.72. For BD+04°2466 the abundance of lead is in agreement with predictions from AGB models. Due to the low luminosity of these two stars, their observed s-process overabundance is better explained by mass-transfer in the past from an AGB star.
Based on observations made with the 1.52 m and 2.2 m telescope at the European Southern Observatory (La Silla, Chile).

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