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

TL;DR

This study provides high-resolution spectroscopic measurements of iron abundances in 18 giant stars across 6 open clusters, aiding in understanding how metallicity influences planet occurrence around evolved stars.

Contribution

It offers new high-precision metallicity data for 6 open clusters, expanding previous analyses and supporting planet search efforts around giant stars.

Findings

Metallicity range from -0.23 to +0.23 dex across clusters.

Data will help disentangle metallicity and mass effects on planet frequency.

Complemented previous cluster analyses with new high-resolution spectra.

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.