Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310l..77s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. L77-L81. NASA-supported rese
Astronomy and Astrophysics
Astrophysics
131
Astronomical Models, Molecular Clouds, Star Formation, Stellar Mass, Supermassive Stars, B Stars, Collisions, H Ii Regions, Interstellar Matter, Luminosity, O Stars
Scientific paper
New CO data from the high-resolution Massachusetts-Stony Brook survey are analyzed to understand the mechanisms responsible for high-mass OB star formation. For a sample of 94 giant molecular clouds associated with high-luminosity radio H II regions, the efficiency (per unit mass of H2) for OB star formation decreases significantly with increasing cloud mass over the range 105 to 3×106M_sun;. It is concluded therefore that massive star formation is generally not stimulated by an internal mechanism such as expanding H II regions in sequential star formation models, which should have a higher efficiency in larger clouds. Instead, it is proposed that OB stars form as a result of cloud-cloud collisions. Cloud-cloud collisions could also account for high rates of massive star formation in the nuclei of high-luminosity infrared galaxies.
Clemens Dan P.
Sanders David B.
Scoville Nicholas Z.
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