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Evolution of star clusters with initial bulk rotation via N-body simulations

Young star clusters can inherit bulk rotation from the molecular clouds from which they have formed. This rotation can affect the long-term evolution of a star cluster and its constituent stellar populations. In this study, we aim to characterize the effects of different degrees of initial rotation...

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Main Authors: Bissekenov, Abylay (Author) , Pang, Xiaoying (Author) , Kamlah, Albrecht (Author) , Kouwenhoven, M. B. N. (Author) , Spurzem, Rainer (Author) , Shukirgaliyev, Bekdaulet (Author) , Giersz, Mirek (Author) , Askar, Abbas (Author) , Berczik, Peter (Author)
Format: Article (Journal)
Language:English
Published: July 2025
In: Astronomy and astrophysics
Year: 2025, Volume: 699, Pages: 1-13
ISSN:1432-0746
DOI:10.1051/0004-6361/202554093
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202554093
Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2025/07/aa54093-25/aa54093-25.html
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Author Notes:Abylay Bissekenov, Xiaoying Pang, Albrecht Kamlah, M. B. N. Kouwenhoven, Rainer Spurzem, Bekdaulet Shukirgaliyev, Mirek Giersz, Abbas Askar, and Peter Berczik
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Summary:Young star clusters can inherit bulk rotation from the molecular clouds from which they have formed. This rotation can affect the long-term evolution of a star cluster and its constituent stellar populations. In this study, we aim to characterize the effects of different degrees of initial rotation on star clusters with primordial binaries. The simulations were performed using NBODY6++GPU. We find that initial rotation strongly affects the early evolution of star clusters. Rapidly rotating clusters show angular momentum transport from the inner parts to the outskirts, resulting in a core collapse. Angular momentum transport is accompanied by a highly elongated barlike structure morphology. The effects of bulk rotation are reduced on the timescale of two-body relaxation. Rotating and nonrotating clusters experience changes in the direction of angular momentum near the dissolution and early evolution due to the tidal field, respectively. We present synthetic observations of simulated clusters for comparison with future observations in filters of Gaia, CSST, and HST. This work shows the effects of bulk rotation on systems with primordial binaries and could be used for the identification of rotation signatures in observed open clusters.
Item Description:Online veröffentlicht: 07. Juli 2025
Gesehen am 06.03.2026
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202554093

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