Radiative transfer in fast-moving media - The limit of the diffusion approximation

Details Radiative transfer in fast-moving media - The limit of the diffusion approximation Radiative transfer in fast-moving media - The limit of the diffusion approximation

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344l..33r&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. L33-L35. Research supported by DFG.

Astronomy and Astrophysics

Astrophysics

1

Diffusion Theory, Radiative Transfer, Stellar Mass Accretion, Approximation, Neutron Stars, Optical Thickness

Scientific paper

The diffusion approximation is a powerful tool to treat radiative transfer in optically thick media. Here, a fundamental limit is shown for the applicability of this approximation when it is used in high-velocity regions; e.g., in accretion columns on neutron stars. The reason for this limitation is the strong advection effect, which strongly impedes the photon transport against the flow of the matter. The essential assumption for the validity of the diffusion equation (namely, that the anisotropy does not become too large) is violated.

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