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2011A&A...531A.133D - Astronomy and Astrophysics, volume 531A, 133-133 (2011/7-1)

High-resolution spectroscopic observations of the metal-poor, chemically peculiar, and high velocity Fehrenbach & Duflot star.


Abstract (from CDS):

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. 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. 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=-259km/s), which in combination with its underabundance of α-elements suggests that this star may have been captured by the Milky Way galaxy.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: individual: Feh-Duf - stars: chemically peculiar - stars: population II - stars: kinematics and dynamics - stars: fundamental parameters

Simbad objects: 1

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