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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. Ecuvillon31 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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