Spectroscopic metallicities for planet-host stars: extending the samples
Abstract
We present stellar parameters and metallicities for 29 planet-host stars, as well as for a large volume-limited sample of 53 stars not known to be orbited by any planetary-mass companion. These stars add to the results presented in our previous series of papers, providing two large and uniform samples of 119 planet-hosts and 94 ``single'' stars with accurate stellar parameters and [Fe/H] estimates. The analysis of the results further confirms that stars with planets are metal-rich when compared with average field dwarfs. Important biases that may compromise future studies are also discussed. Finally, we compare the metallicity distributions for single planet-hosts and planet-hosts in multiple stellar systems. The results show that a small difference cannot be excluded, in the sense that the latter sample is slighly overmetallic. However, more data are needed to confirm this correlation.
Keywords
Cite
@article{arxiv.astro-ph/0504154,
title = {Spectroscopic metallicities for planet-host stars: extending the samples},
author = {N. C. Santos and G. Israelian and M. Mayor and J. P. Bento and P. C. Almeida and S. G. Sousa and A. Ecuvillon},
journal= {arXiv preprint arXiv:astro-ph/0504154},
year = {2009}
}
Comments
Accepted for publication in A&A; Replaced by new version on 19/04/2005: corrections in Tables 1 and 2