The Formation of Globular Clusters as a Case of Overcooling

Abstract

Driven by recent observational findings, we select massive interactive binaries as the most suitable among the existing candidates for producing the chemical patterns typical of multiple populations of Galactic globular clusters. Still, to avoid supernova contamination we are further driven to endorse the notion that above a critical mass stars fail to produce supernova events, but rather eventually sink into black holes without ejecting much energy and heavy metals. This assumption has the attractive implication of suppressing star formation feedback for some 5--10 million years, in practice leading to runaway star formation, analog to {\it overcooling} that in absence of feedback would have turned most baryons into stars in the early Universe. Under such conditions, multiple episodes of stars formation, incorporating binary star ejecta from previous episodes, appear to be unavoidable, thus accounting for the ubiquity of the multiple population phenomenon in globular clusters.

7 pages. Submitted December 13, 2021, in original form, accepter April 2, 2022. To appear on MNRAS

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Cited by in corpus (3)

• Multiple Stellar Populations in Globular Clusters with JWST: a NIRCam view of 47 Tucanae
• Confirmation of a metallicity spread amongst first population stars in globular clusters
• High-precision abundances of first population stars in NGC 2808: confirmation of a metallicity spread