Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sva....21...91n&link_type=abstract
(Astronomicheskii Zhurnal, vol. 54, no. 1, 1977, p. 162-168.) Soviet Astronomy, vol. 21, Jan.-Feb. 1977, p. 91-95. Translation.
Astronomy and Astrophysics
Astronomy
2
Atomic Spectra, Emission Spectra, Fine Structure, Line Spectra, Radiative Transfer, Asymptotic Methods, Atomic Energy Levels, Maxwell-Boltzmann Density Function, Oxygen Spectra, Resonance, Voigt Effect
Scientific paper
The formation of resonance-multiplet lines with a common upper level in a semi-infinite medium is analyzed. An analytical method developed for two-level atoms is used, a Boltzmann distribution of the atomic population in lower-level sublevels is assumed along with full frequency redistribution within each line, and emission-line intensity is expressed in terms of Boltzmann's H-function. Asymptotic and approximate formulas for the H-function are obtained for Doppler as well as Voight absorption coefficients. The Doppler H-function is computed, and the accuracy of the asymptotic solution is evaluated, for the case of the solar O I resonance triplet.
Nagirner Dmitrij I.
Shneivais A. B.
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