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The possible role of stellar mergers for the formation of multiple stellar populations in globular clusters

Wang, L., Kroupa, P., Takahashi, K., & Jerabkova, T. (2020). The possible role of stellar mergers for the formation of multiple stellar populations in globular clusters. Monthly Notices of the Royal Astronomical Society, 491, 440-454. doi:10.1093/mnras/stz3033.

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### Creators

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Creators:
Wang, Long, Author
Kroupa, Pavel, Author
Takahashi, Koh1, Author
Jerabkova, Tereza, Author
Affiliations:
1AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, ou_24008

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Free keywords: Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR, Astrophysics, Galaxy Astrophysics, astro-ph.GA
Abstract: Many possible scenarios for the formation of multiple stellar populations (MSP) in globular clusters (GCs) have been discussed so far, including the involvement of asymptotic giant branch stars, fast rotating main sequence stars, very massive main sequence stars and mass-transferring massive binaries based on stellar evolution modelling. But self-consistent, dynamical simulations of very young GCs are usually not considered. In this work, we perform direct $N$-body modelling such systems with total masses up to $3.2\times10^5$ M$_\odot$, taking into account the observationally constrained primordial binary properties, and discuss the stellar-mergers driven both by binary stellar evolution and dynamical evolution of GCs. The occurrence of stellar mergers is enhanced significantly in binary-rich clusters such that stars forming from the gas polluted by mergers-driven ejection/winds would appears as MSPs. We thus emphasize that stellar mergers can be an important process that connects MSP formation with star cluster dynamics, and that multiple MSP formation channels can naturally work together. The scenario studied here, also in view of a possible top-heavy IMF, may be particularly relevant for explaining the high mass fraction of MSPs (the mass budget problem) and the absence of MSPs in young and low-mass star clusters.

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Dates: 2019-10-302020
Publication Status: Published in print
Pages: 16 pages, 11 figures, accepted for MNRAS
Publishing info: -
Rev. Method: -
Identifiers: arXiv: 1910.14040
DOI: 10.1093/mnras/stz3033
URI: http://arxiv.org/abs/1910.14040
Degree: -

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### Source 1

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Title: Monthly Notices of the Royal Astronomical Society
Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 491 Sequence Number: - Start / End Page: 440 - 454 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150