An abundance analysis of bright giants in the globular cluster NGC 1851

David Yong (RSAA; Frank Grundahl (Univ. of Aarhus); Mt Stromlo Observatory)

arxiv: 0711.1394 · v1 · submitted 2007-11-09 · 🌌 astro-ph

An abundance analysis of bright giants in the globular cluster NGC 1851

David Yong (RSAA , Mt Stromlo Observatory) , Frank Grundahl (Univ. of Aarhus) This is my paper

classification 🌌 astro-ph

keywords clusterabundanceelementsglobularanalysisbrightgiantslarge

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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 omega Centauri.

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