Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...60..416c&link_type=abstract
Icarus (ISSN 0019-1035), vol. 60, Nov. 1984, p. 416-427.
Physics
54
Radioactivity, Solar System, Star Formation, Abundance, Aluminum 26, Asymptotic Giant Branch Stars, Gravitational Collapse, Molecular Clouds, Nuclear Reactions, Red Giant Stars
Scientific paper
A supernova trigger for star formation lacks observational confirmation. Observations of star formation currently point toward nearly isolated individual events taking place in the interiors of dense molecular clouds, in which cores are formed in the clouds and collapse to form stars. If the formation of the solar system proceeded in this manner, then a viable theory of cloud core formation must provide circumstances in which it is not uncommon for the cloud cores to be formed with a significant supply of fresh short-lived radioactivities. A review is made of the evidence for the existence of now extinct radioactivities in primitive solar system material and an examination is made of the implications for the early stages of formation of the Sun and solar system. The characteristics of possible disturbances in dense molecular clouds which can initiate the formation of cloud cores is discussed.
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