paper

Automated spectroscopic abundances of A and F-type stars using echelle spectrographs II. Abundances of 140 A-F stars from ELODIE and CORALIE

arXiv:astro-ph/0210065 · doi:10.1051/0004-6361:20021711

Abstract

Using the method presented in Erspamer & North (2002, Paper I hereafter), detailed abundances of 140 stars are presented. The uncertainties characteristic of this method are presented and discussed. In particular, we show that for a S/N ratio higher than 200, the method is applicable to stars with a rotational velocity as high as 200 km/s. There is no correlation between abundances and vsini, except a spurious one for Sr, Sc and Na which we explain by the small number of lines of these elements combined with a locally biased continuum. Metallic giants (Hauck 1986) show larger abundances than normal giants for at least 8 elements: Al, Ca, Ti, Cr, Mn, Fe, Ni and Ba. The anticorrelation for Na, Mg, Si, Ca, Fe and Ni with vsini suggested by Varenne and Monier (1999) is not confirmed. The predictions of the Montreal models (e.g. Richard et al. 2001) are not fulfilled in general. However a correlation between [Fe/H] and logg is found for stars of 1.8 to 2.0 Mo. Various possible causes are discussed, but the physical reality of this correlation seems inescapable.

17 pages, 14 figures. Accepted for publication in A&A

References in corpus (5)

Cited by in corpus (57)