Issue |
A&A
Volume 493, Number 1, January I 2009
|
|
---|---|---|
Page(s) | 309 - 316 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361:200811093 | |
Published online | 20 November 2008 |
Metallicities for 13 nearby open clusters from high-resolution spectroscopy of dwarf and giant stars*
Stellar metallicity, stellar mass, and giant planets
1
Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal e-mail: nuno@astro.up.pt
2
Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
3
European Southern Observatory, Casilla 19001, Santiago 19, Chile
Received:
6
October
2008
Accepted:
14
November
2008
We present a study of accurate stellar parameters and iron abundances
for 39 giants and 16 dwarfs in the 13 open clusters
IC 2714,
IC 4651,
IC 4756,
NGC 2360,
NGC 2423,
NGC 2447 (M 93),
NGC 2539,
NGC 2682 (M 67),
NGC 3114,
NGC 3680,
NGC 4349,
NGC 5822,
NGC 6633.
The analysis was done using a set of high-resolution and high- spectra
obtained with the UVES spectrograph (VLT). These clusters are currently
being searched for planets using precise radial velocities. For all the
clusters, the derived average metallicities are close to solar. Interestingly,
the values derived seem to depend on the line-list used. This
dependence and its implications for the study of chemical abundances in giants stars are discussed.
We show that a careful choice of the lines may be crucial for the derivation
of metallicities for giant stars on the same metallicity scale as those derived for dwarfs.
Finally, we discuss the implications of the derived abundances for the
metallicity- and mass-giant planet correlation. We conclude that a good knowledge
of the two parameters is necessary to correctly disentangle
their influence on the formation of giant planets.
Key words: stars: planetary systems: formation / stars: abundances / stars: fundamental parameters / techniques: spectroscopic / Galaxy: open clusters and associations: general
© ESO, 2008
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