Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176..367l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 176, Aug. 1976, p. 367-390.
Astronomy and Astrophysics
Astronomy
241
Fragmentation, Gravitational Collapse, Interstellar Gas, Particle Mass, Stellar Evolution, Black Body Radiation, Cosmic Dust, High Temperature Environments, Jeans Theory, Opacity, Radiation Effects, Stellar Mass, Temperature Effects
Scientific paper
Assuming that Jeans' criterion for gravitational instability of a collapsing gas cloud is correct, a minimum mass at which fragmentation must cease is derived in terms of the ratio of electron scattering opacity to gas opacity at the final fragmentation and the ratio of a gas-particle mass to that of the hydrogen atom. A minimum fragment of 0.007 solar mass is computed for a dark molecular cloud and is shown to be insensitive to changes in the gas opacity. Effects of isotropic blackbody radiation on the minimum mass are investigated for primeval star formation and are found to be important for epochs with a redshift of about 2.7. Star formation in the presence of different sources of opacity, cooling agents, and heating mechanisms is considered. It is concluded that dust grains constitute the most important source of opacity for both present and primeval star formation.
Low Clarence
Lynden-Bell Donald
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