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arXiv:astro-ph/0504282 (astro-ph)
[Submitted on 13 Apr 2005]

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

Authors:Sandro Villanova (Padova), Giovanni Carraro (UChile/Yale), Fabio Bresolin (IfA), Ferdinando Ptat (ESO)
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Abstract: 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.
Comments: 20 pages, 6 eps figures, accepted for publication in the Astronomical Journal
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0504282
  (or arXiv:astro-ph/0504282v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0504282
Journal reference: Astron.J.130:652-658,2005
Related DOI: https://doi.org/10.1086/430958

Submission history

From: Giovanni Carraro dr [view email]
[v1] Wed, 13 Apr 2005 14:06:09 UTC (164 KB)
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