Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...531a.133d&link_type=abstract
Astronomy & Astrophysics, Volume 531, id.A133
Astronomy and Astrophysics
Astrophysics
1
Stars: Abundances, Stars: Individual: Feh-Duf, Stars: Chemically Peculiar, Stars: Population Ii, Stars: Kinematics And Dynamics, Stars: Fundamental Parameters
Scientific paper
Aims: We determine the atmospheric parameters and abundance pattern of the chemically peculiar metal-poor Fehrenbach & Duflot (Feh-Duf) star to more clearly understand its evolutionary state and the nature of the s-element enhancement in this star. Methods: Its atmospheric parameters and chemical abundances were determined using high resolution optical spectroscopy and employing the local-thermodynamic-equilibrium model atmospheres of Kurucz and spectral analysis code MOOG. Results: The derived abundances show that the Feh-Duf star is a low-metallicity ([Fe/H] = -1.93) star with high carbon and heavy s-element abundances, while the abundance of the light s-process element yttrium is low ([Y/Fe] = -0.07). The oxygen abundance is lower than for Galactic halo stars of similar metallicity.We conclude that the Feh-Duf star could be a CH star with C/O = 1.3. Another possibility is that the Feh-Duf star could be an early-AGB star. The Fehrenbach & Duflot star is also a lead star with [Pb/Ce] = +0.69. In addition, it displays an extreme retrograde motion (VGRF = -259 km s-1), which in combination with its underabundance of α-elements suggests that this star may have been captured by the Milky Way galaxy.
Based on observations made with the 2.2 m telescope at the European Southern Observatory (La Silla, Chile).Tables 1 and 3 are available in electronic form at http://www.aanda.org
Drake Natalia A.
Pereira Claudio Bastos
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