SCYON Abstract

Received on January 29 2007

Element abundances in the metal rich open cluster NGC6253

AuthorsP. Sestito (1,2), S. Randich (1) and A. Bragaglia (3)
Affiliation
(1) INAF-Osservatorio Astrofisico di Arcetri, Italy
(2) INAF-Osservatorio Astronomico di Palermo, Italy
(3) INAF-Osservatorio Astronomico di Bologna, Italy
Accepted byAstronomy & Astrophysics
Contactsestito@arcetri.astro.it
URLhttp://www.arxiv.org/abs/astro-ph/0701182
Links NGC 6253

Abstract

We have carried out a big FLAMES survey of 10 Galactic open clusters aiming at different goals. One of them is the determination of chemical abundances, in order to put constraints on the radial metallicity gradient in the disk and its evolution. One of the sample clusters is the very metal rich NGC 6253. We have obtained UVES high resolution spectra of seven candidate cluster members (from the turn off up to the red clump) with the goal of determining the chemical composition of NGC 6253 and to investigate its origin and role in the interpretation of the radial metallicity gradient in the disk. Equivalent width analysis and spectral synthesis were performed using MOOG and Kurucz model atmospheres. We derived abundances of Fe, alpha- and Fe-peak elements, the light element Na and the s-process element Ba. Excluding two likely non-members and the clump giant, whose metallicity from equivalent widths is overestimated, we find an average [Fe/H]=+0.36+/-0.07 (rms) for the cluster. For most of the other elements we derive solar abundance ratios.