Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..353g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 353-356.
Astronomy and Astrophysics
Astrophysics
2
Chromosphere, Eddington Approximation, Line Spectra, Spectral Energy Distribution, Coherent Radiation, Lyman Alpha Radiation, Radiative Transfer, Spectrum Analysis, Stellar Spectra
Scientific paper
It is shown that resonance-line wings are just as useful in inferring plane-parallel stellar chromospheric SL distributions as complete redistribution (CRD) profiles. Although coherent scattering effects at a given frequency tend to average depth-dependent parameters over a larger volume than in CRD, this effect can be offset by simply looking closer to line center, where the same depth-dependent information exists as in CRD, albeit somewhat more compressed in frequency space. For resonance lines with high excitation energies such as Ly-alpha, steep Planck function gradients can invalidate the modified Eddington-Barbier approach given, but this problem also exists in CRD.
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