Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....53..107v&link_type=abstract
Astronomy and Astrophysics, vol. 53, no. 1, Nov. 1976, p. 107-114.
Astronomy and Astrophysics
Astrophysics
9
Atmospheric Models, Chromosphere, Distribution Functions, Line Shape, Radiative Transfer, Stellar Atmospheres, Frequency Response, Limb Darkening, Line Spectra, Stellar Models, Stellar Spectra
Scientific paper
Solutions to the equation of radiative transfer for spectral-line formation are obtained using the full-angle and frequency-dependent redistribution functions R II and R III in one-dimensional chromospheric-type model stellar atmospheres. It is found that the angle dependency of these redistribution functions plays a significantly less important role than does the corresponding frequency dependence in determining the emergent line profile for one-dimensional geometries. It is further found that the results obtained using R III (both angle dependent and angle averaged) are only slightly different from those using complete redistribution. In contrast, the wing frequency coherency of R II significantly affects the emergent line profile by drastically reducing the wing intensities, yielding limb-darkening at almost all frequencies, and enhancing the effect of the macroscopic velocity field. More particularly, R II produces emission peaks in the emergent line profile even for photoelectrically controlled spectral lines
Cannon Joseph C.
Vardavas Ilias M.
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