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The relationship between globular cluster parameters and abundance variations

Published online by Cambridge University Press:  11 March 2020

David M. Nataf Open the ORCID record for David M. Nataf [Opens in a new window]
David M. Nataf*
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD21218 emails: [email protected], [email protected]
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Abstract

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We discuss a meta-analysis of the association of abundance variations in globular cluster stars with the present-day stellar mass and metallicity of globular clusters. Using data for 42 globular clusters that are well-sampled from either or both of prior literature studies and the APOGEE survey, we confirm prior findings that increasing aluminum abundance variations in globular clusters are positively correlated with increasing present-day stellar mass or decreasing metallicity. We also demonstrate that the ratio of aluminum abundance variations to either nitrogen abundance variations or sodium abundance variations is itself positively correlated with decreasing metallicity and increasing stellar mass of globular clusters. This suggests that there were at least two non-supernovae chemical polluters that were active in the early universe.

Keywords

Globular Clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 333 - 336
Copyright
© International Astronomical Union 2020

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