Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..479v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 2, March 1985, p. 479-484. Research supported by the Deutsche Forschu
Astronomy and Astrophysics
Astrophysics
5
Cyclotron Radiation, High Temperature Plasmas, Neutron Stars, Particle Diffusion, Plasma Spectra, Radiative Transfer, Absorption Cross Sections, Diffusion Theory, Scattering Coefficients
Scientific paper
The structure of cyclotron line profiles in approximate treatments of radiative transfer in strongly magnetized (B of approximately 10 to the 12th G) plasma systems is discussed. It is shown how the uncritical use of scattering and absorption cross sections in coherent transfer calculations may lead to unphysical cyclotron line structures. A new concept for the treatment of coherent radiative transfer in the frame of the diffusion approximation is introduced: whereas the full angle dependence in the photon normal modes is retained, the thermal width of the Voigt line profile during the scattering process is determined by a constant 'standardized' angle Theta(T). By means of this concept the principle of microreversibility can be ensured and physically reasonable photon fluxes emitted e.g., from the accretion column of X-ray pulsars can be obtained.
Herold Heinz
Ruder Hanns
Soffel Michael
Ventura Joana
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