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2005A&A...437.1127S - Astronomy and Astrophysics, volume 437, 1127-1133 (2005/7-3)

Spectroscopic metallicities for planet-host stars: Extending the samples.

SANTOS N.C., ISRAELIAN G., MAYOR M., BENTO J.P., ALMEIDA P.C., SOUSA S.G. and ECUVILLON A.

Abstract (from CDS):

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.