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Recent Ideas on the Formation of Massive Stars in our Galaxy

Published online by Cambridge University Press:  04 August 2017

D. Downes
D. Downes*
Affiliation:
Institut de Radioastronomie Millimétrique, Voie 10, Domaine Universitaire, 38406 St. Martin d'Hères, France

Abstract

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The massive OB stars in our Galaxy form predominantly in the warm giant molecular clouds which constitute the spiral arms. The clouds are subject to a variety of mechanisms which retard or prevent further contraction, but are nevertheless able to form stable “cores”. In the regime of subsonic internal motions, the cores may be regarded as potential protostars. The formation of massive cores, which then form massive stars, may initially be determined by the statistics of fragmentation, but may then be a feedback process, once underway, due to the steep increase of the minimum Jeans' mass with increasing temperature of the surroundings. This concept is the basis for the model of bi-modal star formation, and its implications for the initial mass function and the distribution of massive stars and metallicity gradients in the Galaxy.

Type
I. Star Forming Processes in the Solar Neighborhood
Information
Symposium - International Astronomical Union , Volume 115: Star Forming Regions , 1987 , pp. 93 - 109
Copyright
Copyright © Reidel 1987 

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