Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...61..177p&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 61, May 1986, p. 177-195. NSERC-supported research.
Astronomy and Astrophysics
Astrophysics
188
Diffusion Coefficient, Plasma Diffusion, Space Plasmas, Stellar Envelopes, White Dwarf Stars, Boltzmann Transport Equation, Chapman-Enskog Theory, Collision Parameters, Coulomb Potential, Dense Plasmas, Thermal Diffusion
Scientific paper
The diffusion coefficients of relatively dense plasmas that are typical of white dwarf envelopes are presently computed by means of an approximate method, based on the numerical evaluation of collision integrals for a screened Coulomb potential, which becomes rigorously valid in the limit of a dilute plasma. The plasmas encountered in white dwarf envelopes are noted to be neither weakly nor strongly coupled; a comparison with the results of rigorous Monte Carlo calculations applicable at very high densities indicates, however, that the region of intermediate coupling is probably reasonably bridged. Results are presented in the form of high accuracy analytic fits for the collision integrals.
Fontaine Gérard
Michaud Georges
Paquette Charles
Pelletier Christine C.
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