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Stellar Abundances in the Oldest Open Cluster: Berkeley 17

Published online by Cambridge University Press:  23 December 2005

E.D. Friel ,
H.R. Jacobson  and
C.A. Pilachowski
E.D. Friel
Affiliation:
Division of Astronomical Sciences, National Science Foundation, Arlington, VA, 22230 USA email: [email protected]
H.R. Jacobson
Affiliation:
Department of Astronomy, Indiana University, Bloomington, IN, 47405 USA email: [email protected], [email protected]
C.A. Pilachowski
Affiliation:
Department of Astronomy, Indiana University, Bloomington, IN, 47405 USA email: [email protected], [email protected]
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Abstract

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As part of a program of abundance studies of old open clusters, we present an analysis of high-dispersion echelle spectra of three giant stars in the 10 Gyr old cluster Berkeley 17. Abundances were determined relative to the disk giant Arcturus. Be 17 is found to have a mean [Fe/H] = −0.10 ±0.05 (mean error). Oxygen abundances, determined from the forbidden [O I] lines, show solar abundance ratios. The α-elements Mg, Ca, and Ti also show scaled solar abundance ratios, with suggestions that the Si abundance is slightly enhanced. The odd-Z elements Na and Al are significantly enhanced relative to scaled solar abundances. These abundance patterns are similar to those in two other 8-10 Gyr old open clusters, Cr261 and NGC 6791, and suggest that the Galactic disk was enriched to solar abundance levels at very early times.

Keywords

Stars:abundancesGalaxy:open clusters and associations: individual (Be 17)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 397 - 398
Copyright
© 2005 International Astronomical Union