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Title:
An Abundance Analysis of Bright Giants in the Globular Cluster NGC 1851
Authors:
Yong, David; Grundahl, Frank
Affiliation:
AA(Research School of Astronomy and Astrophysics, Australian National University, Weston, ACT 2611, Australia ), AB(Department of Physics and Astronomy, University of Aarhus, Denmark )
Publication:
The Astrophysical Journal, Volume 672, Issue 1, pp. L29-L32. (ApJL Homepage)
Publication Date:
01/2008
Origin:
UCP
Astronomy Keywords:
Galaxy: Globular Clusters: Individual: NGC Number: NGC 1851, Stars: Abundances
DOI:
10.1086/525850
Bibliographic Code:
2008ApJ...672L..29Y

Abstract

We present the chemical compositions for eight bright giants in the globular cluster NGC 1851. Our analysis reveals large star-to-star abundance variations and correlations of the light elements O, Na, and Al, a feature found in every well-studied globular cluster. However, NGC 1851 also exhibits large star-to-star abundance variations of the s-process elements Zr and La. These s-process elements are correlated with Al and anticorrelated with O. Furthermore, the Zr and La abundances appear to cluster around two distinct values. A recent study revealed a double subgiant branch in NGC 1851. Our data reinforce the notion that there are two stellar populations in NGC 1851 and indicate that this cluster has experienced a complicated formation history with similarities to ω Centauri.

Based on observations made with ESO Telescopes at the Paranal Observatories under programme 70.B-0361(A)

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