Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-06-16
Astronomy and Astrophysics
Astrophysics
LaTeX (style file included), 12 pages, 4 figures, poster presented at NATO ASI on The Physics of Star Formation and Early Stel
Scientific paper
Simulations with Aarseth's (1994) NBODY5 code are presented of an initially dense binary-rich cluster. It is assumed that the star formation efficiency is 50 per cent with instantaneous mass loss. The model central density and velocity dispersion agree with the observational constraints if expansion is only about 6x10^4 yr old. Additionally, the observed binary proportion constrains the primordial proportion to have been significantly less than in Taurus--Auriga. The claim that a variation of the birth binary proportion with gas cloud parameters has been detected, however, can only be verified if the cluster can be shown to be expanding rapidly.
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