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The emergence of multiple populations in radiation hydrodynamics simulations of cluster formation

Published online by Cambridge University Press:  11 March 2020

Alison Sills Open the ORCID record for Alison Sills [Opens in a new window]
Alison Sills*
Affiliation:
Department of Physics & Astronomy, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4M1, CANADA email: asills@mcmaster.ca
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Abstract

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We present a new approach to understanding star-to-star helium abundance variations within globular clusters. We begin with detailed radiation hydrodynamics simulations of cluster formation within giant molecular clouds, and investigate the conditions under which multiple populations could be created. Chemical enrichment occurs dynamically as the cluster is assembled. We test two extreme mechanisms for injection of enriched gas within the clusters, and find that realistic multiple populations can be formed in both mechanisms. The stochastic cluster formation histories are dictated by the inherent randomness of the timing and location of the formation of small clusters, which rapidly merge to build up the larger cluster, in combination with continual accretion of gas from the cloud. These cluster formation histories naturally produce a diversity of abundance patterns across the massive cluster population. We conclude that multiple populations are a natural outcome of the typical mode of star cluster formation.

Keywords

globular clusters: generalstars: formation
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. 337 - 340
Copyright
© International Astronomical Union 2020

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