Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Expanding Trapezium Cluster?   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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The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th