Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280..809s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 15, 1984, p. 809-818.
Astronomy and Astrophysics
Astrophysics
10
Compton Effect, Opacity, Stellar Mass Accretion, X Ray Sources, Bremsstrahlung, Distribution Functions, Electron Energy, Hydrodynamics, Hydrogen Plasma, Photons, Plasma-Electromagnetic Interaction
Scientific paper
Frequency-dependent opacities and mean relaxation times for the hydrodynamical moments are derived. Temperature-density regimes, dominated by multiple Compton scattering combined with emission and absorption processes, are considered. Exact solutions of the Kompaneets equation, linearized around Planck equilibrium, yield 'generalized Kramers approximations' for the opacities for bremsstrahlung plus Comptonization and for double-Compton plus Comptonization. Corrections and modifications are discussed. The rough orders of magnitude of the resulting mean photon relaxation times are consistent with the photon energy generation times computed earlier by Thorne from an ad hoc procedure. This approach covers nondegenerate plasmas at nonrelativistic temperatures, but it can be extended to the case of nondegenerate plasmas at relativistic temperatures. Strong magnetic fields are excluded.
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