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Published March 15, 1994 | Published
Journal Article Open

On the polarization of resonantly scattered emission lines – I. Emission and absorption coefficients in an anisotropic radiation field


Source functions and absorptions coefficients for polarized radiation in a given ansiotropic radiation field are calculated for a variety of permitted electric dipole transitions in the L–S coupling limit. Collisional, radiative and magnetic mixing of the ground sublevels are all considered. The polarization of the self-consistent, emergent radiation field is computed, using an anisotropic escape probability formalism to treat the radiative transfer. It is found that the radiative mixing can enhance the polarization for transitions with large angular momentum, and degrees of polarization ≲ 10 per cent are obtained for transitions with small angular momentum.

Additional Information

© 1994 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Accepted 1993 October 14. Received 1993 August 24; in original form 1993 June 23. We thank M. Cohen, R. Emmering, R. Goodrich and J. Miller for helpful discussions. We are very grateful to G. M. Voit for his friendly comments and advice. Support under NASA grant NAGW2372 and NSF grant AST89-17765 is gratefully acknowledged.

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August 20, 2023
August 20, 2023