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2006ApJ...644..355H - Astrophys. J., 644, 355-363 (2006/June-2)
Star formation in space and time: the Orion nebula cluster.
HUFF E.M. and STAHLER S.W.
Abstract (from CDS):
Our reconstruction of the parent molecular cloud spawning the cluster shows that it had a mass of 6700 M☉prior to its destruction by the Trapezium. If the cloud was supported against self-gravity by mildly dissipative turbulence, then it contracted in a quasi-static but accelerating manner. We demonstrate this contraction theoretically through a simple energy argument. The mean turbulent speed increased to its recent value, which is reflected in the present-day stellar velocity dispersion.
The current ONC will be gravitationally unbound once cloud destruction is complete, and is destined to become a dispersing OB association. We hypothesize that similarly crowded groups seen at the centers of distant OB associations are also unbound and do not give rise to the Galactic population of open clusters. Finally, accelerating star formation implies that most clumps within giant molecular complexes should have relatively low formation activity. Sensitive infrared surveys could confirm this hypothesis.
Abstract Copyright: ∼
Journal keyword(s): open clusters and associations: individual (Orion Nebula cluster) - Stars: Formation - Stars: Pre-Main-Sequence
Simbad objects: 5
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