Self-regulated star formation and the evolution of stellar systems

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Molecular Clouds, Star Clusters, Star Formation, Stellar Evolution, Stellar Systems, B Stars, Mass Spectra, O Stars, Stellar Mass

Scientific paper

The star formation efficiency is estimated, using the assumption that star formation continues until the radiation pressure disrupts the cloud. The results suggest that in the case of low/medium-mass star formation the efficiency could be about five times higher than in the case of high-mass star formation. For a three-component star-forming system (low/medium-mass stars, high-mass stars, gas) the temporal behavior and the final star formation efficiency are investigated. It is shown that the efficiency in 10 to the 4th solar mass clouds is higher than in the 10 to the 6th solar mass clouds. This supports the view that bound stellar systems form from medium-mass clouds, whereas OB associations form in the cores of giant molecular clouds. Furthermore, the effect of induced high-mass star formation may cause a change of the mass spectrum during the formation of an OB association.

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