Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...613l.181k&link_type=abstract
The Astrophysical Journal, Volume 613, Issue 2, pp. L181-L184.
Astronomy and Astrophysics
Astronomy
8
Radiative Transfer, Stars: Coronae, Sun: Uv Radiation, X-Rays: General
Scientific paper
An analysis of radiative transfer effects present in the Fe XV ion stage of solar and stellar coronal plasmas provides a general explanation of line radiation intensity enhancement above the optically thin limit. Full linearization radiation transfer is compared with the escape factor method and found to be in good agreement at the lower column densities. An angular study of the enhancement shows that symmetry factors are of great importance. This gives a possible reason for the indeterminate status of opacity in relation to coronal lines of distant stellar sources, where only emission integrated across the whole surface is detected.
Keenan Francis P.
Kerr F. M.
Rose Steve J.
Wark J. S.
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