Volume 538, February 2012
|Number of page(s)||6|
|Section||Planets and planetary systems|
|Published online||17 February 2012|
Metallicities for six nearby open clusters from high-resolution spectra of giant stars⋆
[Fe/H] values for a planet search sample
Centro de Astrofísica, Universidade do Porto,
Rua das Estrelas, 4150-762
2 Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Portugal
3 Observatoire de Genève, Université de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
4 Departamento de Astronomia do IAG/USP, Universidade de São Paulo, Rua do Matão 1226, Cidade Universitária, 05508-900 São Paulo, SP, Brasil
Received: 14 October 2011
Accepted: 20 December 2011
We present a study of the stellar parameters and iron abundances of 18 giant stars in six open clusters. The analysis was based on high-resolution and high-S/N spectra obtained with the UVES spectrograph (VLT-UT2). The results complement our previous study where 13 clusters were already analyzed. The total sample of 18 clusters is part of a program to search for planets around giant stars. The results show that the 18 clusters cover a metallicity range between −0.23 and +0.23 dex. Together with the derivation of the stellar masses, these metallicities will allow the metallicity and mass effects to be disentangled when analyzing the frequency of planets as a function of these stellar parameters.
Key words: planetary systems / stars: abundances / techniques: spectroscopic / open clusters and associations: general / stars: fundamental parameters
© ESO, 2012
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