Metal Abundances in Extremely Distant Galactic Old Open Clusters. II. Berkeley 22 and Berkeley 66
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+/-0.19 and -0.48+/-0.24 for Be 22 and Be 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 the work of Friel and coworkers and are genuine Galactic disk objects.
The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.- Publication:
-
The Astronomical Journal
- Pub Date:
- August 2005
- DOI:
- 10.1086/430958
- arXiv:
- arXiv:astro-ph/0504282
- Bibcode:
- 2005AJ....130..652V
- Keywords:
-
- Galaxy: Open Clusters and Associations: General;
- Galaxy: Open Clusters and Associations: Individual: Name: Berkeley 22;
- Galaxy: Open Clusters and Associations: Individual: Name: Berkeley 66;
- Astrophysics
- E-Print:
- 20 pages, 6 eps figures, accepted for publication in the Astronomical Journal