Statistics – Computation
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.204..129v&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 204, no. 1, p. 129-139.
Statistics
Computation
1
Astronomical Models, Molecular Collisions, Stellar Envelopes, Abundance, Computational Astrophysics, Stellar Composition, Stellar Temperature, Turbulence Effects, Viscosity
Scientific paper
Inelastic molecular collisions are incorporated into the statistical model for turbulent circumstellar discs and are found to provide a more effective cooling mechanism than molecule-grain impacts. Examination of the viscous evolution of the disc shows that the chemical composition and the coefficient of viscosity are crucial for determining the existence and properties of a state of equilibrium. A detailed study is carried out for carbon monoxide and hydroxyl. Abundances as small as 10 exp -5 for CO and 10 exp -8 for OH are sufficient to balance the disc against the viscous production of heat. The disc is usually nonconvective. Near the equilibrium state the dust layer becomes thin enough to be gravitationally unstable. Infall of interstellar material is not expected to change the occurrence of instability, since the disc was not found to be convective even in the homogeneous circumstances. The results also remain unaltered even if the abundances of coolants are reduced by several orders of magnitude.
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