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

Young Wook Lee, Jenny J. Kim, Sohee Jang, Chul Chung, Dongwook Lim, Seungsoo Hong

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)321-323
Number of pages3
JournalProceedings of the International Astronomical Union
Volume14
Issue number351
DOIs
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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