Statistics – Computation
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..156v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 156-163. Research supported by FNRS.
Statistics
Computation
29
Early Stars, Molecular Clouds, Star Clusters, Star Formation, Computational Astrophysics, Gravitational Collapse, Interstellar Magnetic Fields, Spatial Distribution, Velocity Distribution, Virial Theorem
Scientific paper
When a star-forming molecular cloud core produces young stars with a smaller velocity dispersion than that of the gas, or if a magnetic field is important for the support of the original gas cloud, the newly formed stars will collapse and revirialize in a smaller volume before the gas removal process sets in. Analytical calculations of the collapse factor and the new effective star-formation efficiency (SFE) in the collapsed cluster volume are presented as a function of the intrinsic SFE and as a function of a parameter describing the smaller stellar velocity dispersion or the relative strength of the magnetic field. This is done for five different cloud models. An approximate relation, nearly independent of the cloud model, between the critical intrinsic SFE for producing a bound cluster after rapid gas removal and epsilon yields a general lower limit for the critical SFE of 0.15, and of 0.30 in the magnetic-field case.
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