Relativistic free-free opacity for a high-temperature stellar plasma

Details Relativistic free-free opacity for a high-temperature stellar plasma Relativistic free-free opacity for a high-temperature stellar plasma

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294...17i&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 1, 1985, p. 17-22.

Statistics

19

Bremsstrahlung, Cosmic Plasma, High Temperature Plasmas, Opacity, Relativity, Stellar Physics, Electron Density (Concentration), Fermi-Dirac Statistics, Stellar Winds

Scientific paper

The free-free opacity is calculated for a high-temperature stellar plasma by using the accurate relativistic cross section. The effect of electron degeneracy is accurately taken into account. The thermally averaged Gaunt factor of the free-free opacity is found to increase rapidly at high temperatures, T greater or equal to 10 to the 8th K. Karzas and Latter's (1961) nonrelativistic calculation of the thermally averaged Gaunt factor is shown to deviate from the present relativistic calculation for gamma-squared equal to 0.01 or less. The results of the calculation for the temperature region 10 to the 6th - 10 to the 8th K are fitted by accurate analytic formulas to facilitate applications.

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