Kavli Affiliate: Rainer Spurzem
| First 5 Authors: Abylay Bissekenov, Xiaoying Pang, Albrecht Kamlah, M. B. N. Kouwenhoven, Rainer Spurzem
| 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 are 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 bar-like structure
morphology. The effects of bulk rotation are reduced on the timescale of
two-body relaxation. Rotating and non-rotating 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.
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