Other
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991em%26p...54..203a&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 54, Sept. 1991, p. 203-239.
Other
3
Astronomical Models, Ellipticity, Globular Clusters, Magellanic Clouds, Contraction, Gravitational Effects, Momentum Transfer, Relaxation (Mechanics), Relaxation Time, Tides
Scientific paper
N-body simulations are conducted with attention to time evolution in the ellipticity of the globular clusters in order to examine the dynamical evolution of the clusters in the Large Magellanic Cloud (LMC). A binary globular cluster is merged with an elliptical cluster, and two-body relaxation and the LMC's tidal field act upon the shape of the combined body. The inner region becomes rounder because gravothermal contraction causes outward angular momentum transport, and the time scale of the decreasing ellipticity is determined in a relative temporal sense. Observed ellipticity data corresponding to the half-mass radius of LMC clusters are analyzed in terms of the results of the N-body simulations. Based on the relaxation and crossing times for the observed clusters, the effective time for achieving roundness is examined. The observed ellipticities are shown to be consistent with the proposed timescale related to the results of the simulation.
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