Detailed Analysis of Nearby Bulge-like Dwarf Stars I. Stellar Parameters, Kinematics and Oxygen Abundances

Abstract

High resolution échelle spectra were obtained with the FEROS spectrograph at the 1.5m ESO telescope for 35 nearby bulge-like stars with metallicities in the range -0.8 $\le$ [Fe/H] $\le$ +0.4. Geneva photometry, astrometric data from Hipparcos and radial velocities from Coravel are available for these stars. From Hipparcos data it appears that the turnoff of this population indicates an age of 10-11 Gyr (Grenon 1999). Detailed analysis of the sample stars is carried out and atmospheric parameters derived from spectroscopic and photometric determinations are presented. Oxygen abundances are derived based on the forbidden [O I] $\lambda$ 6300.3 {\rm Å} line. The results show an oxygen overabundance pattern for most of the sample stars when compared to their disk counterparts.

15 pages, 6 figures

References in corpus (1)

• Abundance Gradients and the Formation of the Milky Way

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