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Preprint
Massive Star Cluster Formation with Binaries. I. Evolution of Binary Populations
IACAPAP ArXiv (Online)
09 Oct 2024
Abstract
We study the evolution of populations of binary stars within massive
cluster-forming regions. We simulate the formation of young massive star
clusters within giant molecular clouds with masses ranging from 2 x 10$^{4}$ to
3.2 x 10$^{5}$ M$_{\odot}$. We use Torch, which couples stellar dynamics,
magnetohydrodynamics, star and binary formation, stellar evolution, and stellar
feedback through the AMUSE framework. We find that the binary fraction
decreases during cluster formation at all molecular cloud masses. The binaries'
orbital properties also change, with stronger and quicker changes in denser,
more massive clouds. Most of the changes we see can be attributed to the
disruption of binaries wider than 100 au, although the close binary fraction
also decreases in the densest cluster-forming region. The binary fraction for O
stars remains above 90%, but exchanges and dynamical hardening are ubiquitous,
indicating that O stars undergo frequent few-body interactions early during the
cluster formation process. Changes to the populations of binaries are a
by-product of hierarchical cluster assembly: most changes to the binary
population take place when the star formation rate is high and there are
frequent mergers between sub-clusters in the cluster-forming region. A
universal primordial binary distribution based on observed inner companions in
the Galactic field is consistent with the binary populations of young clusters
with resolved stellar populations, and the scatter between clusters of similar
masses could be explained by differences in their formation history.
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Details
- Title
- Massive Star Cluster Formation with Binaries. I. Evolution of Binary Populations
- Creators
- Claude Cournoyer-CloutierAlison SillsWilliam E HarrisBrooke PolakSteven RiederEric P AnderssonSabrina M AppelMordecai-Mark Mac LowStephen McMillanSimon Portegies Zwart
- Publication Details
- IACAPAP ArXiv (Online)
- Resource Type
- Preprint
- Language
- English
- Academic Unit
- Physics
- Other Identifier
- 991021929456704721