Metallicities for 6 nearby open clusters from high-resolution spectra of giant stars. [Fe/H] values for a planet search sample

Abstract

We present a study of the stellar parameters and iron abundances of 18 giant stars in 6 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.

Accepted for publication in Astronomy&Astrophysics

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• Homogeneous spectroscopic parameters for bright planet host stars from the northern hemisphere
• Searching for Li-rich giants in a sample of 12 open clusters: Li enhancement in two stars with substellar companions
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• Measuring Diffuse Interstellar Bands with cool stars. An improved line list to model the background stellar spectra