Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...76..759l&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 76, June 1991, p. 759-801. Sun Microsystems Inc.-supported resear
Astronomy and Astrophysics
Astrophysics
100
Abundance, Gas Composition, Opacity, Protostars, Stellar Mass Accretion, Equilibrium Equations, Gas Density, Hydrogen, Local Thermodynamic Equilibrium, Plancks Constant
Scientific paper
Planck and Rosseland mean opacities of a zero-metallicity gas are calculated over a range of densities 10 to the -12th to 0.5 g/cu cm and temperatures 1000-7000 K typical of accreting low-mass protostars. Equilibrium equations for the creation and destruction of the major chemical species are formulated and solved. The previous LTE analysis is extended by considering the effect of arbitrary dilutions of a radiation field with color temperature the same as the matter temperature. The individual species' contributions to the monochromatic opacities are analyzed. It is found that the mechanism of collision-induced absorption by H2 dominates the opacities at high density and low temperature. Four different mechanisms are found to control the Rosseland mean continuum opacity: collision-induced absorption by H2; bound-free absorption by H(-); Rayleigh scattering by H, H2, and He; and Thomson scattering.
Chernoff David F.
Lenzuni Paolo
Salpeter Edwin E.
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