EDP Sciences
Free access
Issue
A&A
Volume 437, Number 3, July III 2005
Page(s) 1127 - 1133
Section Planets and planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20052895


A&A 437, 1127-1133 (2005)
DOI: 10.1051/0004-6361:20052895

Spectroscopic metallicities for planet-host stars: Extending the samples

N. C. Santos1, 2, G. Israelian3, M. Mayor2, J. P. Bento1, P. C. Almeida1, S. G. Sousa1 and A. Ecuvillon3

1  Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal
    e-mail: Nuno.Santos@oal.ul.pt
2  Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
3  Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain

(Received 17 February 2005 / Accepted 23 March 2005 )

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.


Key words: stars: abundances -- stars: fundamental parameters -- stars: chemically peculiar -- stars: planetary systems -- stars: planetary systems: formation

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© ESO 2005