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• W2891714653 abstract "We investigate the dynamical evolution of star clusters during their formation, assuming that they are born from a turbulent starless clump of a given mass that is embedded within a parent self-gravitating molecular cloud characterized by a particular mass surface density. In contrast to the standard practice of most N-body studies, we do not assume that all stars are formed at once. Rather, we explore the effects of different star formation rates on the global structure and evolution of young embedded star clusters, also considering various primordial binary fractions and mass segregation levels. Our fiducial clumps studied in this paper have initial masses of |$M_{rm cl} = 3000, M_odot$|⁠, are embedded in ambient cloud environments of Σcloud = 0.1 and 1 g cm−2, and gradually form stars with an overall efficiency of 50 per cent until the gas is exhausted. We investigate star formation efficiencies per free-fall time in the range εff = 0.01–1, and also compare to the instantaneous case (εff = ∞) of Paper I. We show that most of the interesting dynamical processes that determine the future of the cluster, happen during the early formation phase. In particular, the ejected stellar population is sensitive to the duration of star cluster formation: for example, clusters with longer formation times produce more runaway stars, since these clusters remain in a dense state for longer, thus favouring occurrence of dynamical ejections. We also show that the presence of radial age gradients in star clusters depends sensitively on the star formation efficiency per free-fall time, with observed values being matched best by our slowest forming clusters with εff ≲ 0.03." @default.
• W2891714653 created "2018-09-27" @default.
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• W2891714653 date "2018-12-20" @default.
• W2891714653 modified "2023-09-27" @default.
• W2891714653 title "Star cluster formation from turbulent clumps. II. Gradual star cluster formation" @default.
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• W2891714653 doi "https://doi.org/10.1093/mnras/sty3470" @default.
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