Statistics – Computation
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987kfnt....3...40s&link_type=abstract
Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 3, Mar.-Apr. 1987, p. 40-48. In Russian.
Statistics
Computation
6
Fraunhofer Lines, Potassium, Resonance Lines, Solar Spectra, Thermodynamic Equilibrium, Abundance, Computational Astrophysics
Scientific paper
Non-LTE formation of the K I 769.9-nm resonance line observed in the spectrum of quiet regions in the solar disk is discussed. Coefficients of LTE departure are obtained for the populations of six K I levels. The sensitivity of the present solution to such parameters as multilevel atomic structure, the photoionization cross-sections of subordinate levels, the temperature of the solar atmosphere, and the abundance of potassium is analyzed. It is shown that theoretical center-to-limb variations of the central residual intensity and 769.9-nm profiles, calculated with allowance for departure from LTE, are in close agreement with observations. It is concluded that the LTE hypothesis is not valid for the K I resonance line. The abundance of potassium in the sun is log A(K) = 5.08 + or - 0.1.
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