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Multiple populations in globular clusters: New insights from chemical evolution and horizontal-branch models

Published online by Cambridge University Press:  11 March 2020

Young-Wook Lee Open the ORCID record for Young-Wook Lee [Opens in a new window] ,
Jenny J. Kim ,
Sohee Jang ,
Chul Chung ,
Dongwook Lim  and
Seungsoo Hong
Young-Wook Lee
Affiliation:
Center for Galaxy Evolution Research and Department of Astronomy, Yonsei University, Seoul03722, Korea email: ywlee2@yonsei.ac.kr
Jenny J. Kim
Affiliation:
Center for Galaxy Evolution Research and Department of Astronomy, Yonsei University, Seoul03722, Korea email: ywlee2@yonsei.ac.kr Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstraße 12-14, 69120 Heidelberg, Germany
Sohee Jang
Affiliation:
Center for Galaxy Evolution Research and Department of Astronomy, Yonsei University, Seoul03722, Korea email: ywlee2@yonsei.ac.kr
Chul Chung
Affiliation:
Center for Galaxy Evolution Research and Department of Astronomy, Yonsei University, Seoul03722, Korea email: ywlee2@yonsei.ac.kr
Dongwook Lim
Affiliation:
Center for Galaxy Evolution Research and Department of Astronomy, Yonsei University, Seoul03722, Korea email: ywlee2@yonsei.ac.kr Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstraße 12-14, 69120 Heidelberg, Germany
Seungsoo Hong
Affiliation:
Center for Galaxy Evolution Research and Department of Astronomy, Yonsei University, Seoul03722, Korea email: ywlee2@yonsei.ac.kr
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Abstract

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In order to investigate the origin of multiple populations in globular clusters (GCs), we have constructed new chemical evolution models for proto-GCs where the supernova blast waves undergo blowout without expelling the ambient gas. Chemical enrichments in our models are then dictated by the winds of massive stars together with the asymptotic-giant-branch stars ejecta. We find that the observed Na-O anti-correlation can be reproduced when multiple episodes of starburst and enrichment are allowed to continue in proto-GCs. The “mass budget problem” is mostly resolved by our models without ad-hoc assumptions on star formation efficiency, initial mass function, and significant loss of first-generation stars. Interestingly, ages and chemical abundances predicted by this chemical evolution model are in good agreements with those independently obtained from our stellar evolution model for the horizontal-branch. We also discuss observational evidence for the GC-like multiple populations in the Milky Way bulge.

Keywords

globular clustersmultiple populationsMilky Way bulge
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. 321 - 323
Copyright
© International Astronomical Union 2020

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