Abstract
Observations of very massive stars (M≥10M ⊙) are suggestive of a star formation process which requires an external trigger. However, observations pertaining to the formation of stars of lower mass (M≤9M ⊙) require no such triggering mechanism and are consistent with the idea that such stars form as a natural consequence of the evolution, gravitational collapse and fragmentation of a proto-stellar molecular cloud.
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Lada, C.J. The locations of newly formed stars in molecular clouds. The Moon and the Planets 19, 157–158 (1978). https://doi.org/10.1007/BF00896986
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DOI: https://doi.org/10.1007/BF00896986