Metal abundances in extremely distant Galactic old open clusters. II. Berkeley 22 and Berkeley 66

Details Metal abundances in extremely distant Galactic old open clusters. II. Berkeley 22 and Berkeley 66 Metal abundances in extremely distant Galactic old open clusters. II. Berkeley 22 and Berkeley 66

2005-04-13

arxiv.org/abs/astro-ph/0504282v1

Astron.J.130:652-658,2005

Astronomy and Astrophysics

Astrophysics

20 pages, 6 eps figures, accepted for publication in the Astronomical Journal

Scientific paper

10.1086/430958

We report on high resolution spectroscopy of four giant stars in the Galactic old open clusters Berkeley~22 and Berkeley~66 obtained with HIRES at the Keck telescope. We find that $[Fe/H]=-0.32\pm0.19$ and $[Fe/H]=-0.48\pm0.24$ for Berkeley~22 and Berkeley~66, respectively. Based on these data, we first revise the fundamental parameters of the clusters, and then discuss them in the context of the Galactic disk radial abundance gradient. We found that both clusters nicely obey the most updated estimate of the slope of the gradient from \citet{fri02} and are genuine Galactic disk objects.

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