Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..296a&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 296-308.
Astronomy and Astrophysics
Astrophysics
56
Abundance, Atmospheric Models, Calcium, Line Shape, Photosphere, Solar Atmosphere, Damping, Helium, Hydrogen, Solar Spectra, Spectral Line Width, Stellar Models
Scientific paper
A general iterative method is described for constructing thermal models of the solar photosphere consistent with observed strong and weak lines of Ca I and Ca II. Calibrations of the solar calcium abundance and the van der Waals parameter for important Ca I and Ca II lines are obtained using plane-parallel largely LTE model atmospheres, and these thermal models are modified for better fits to the measured Ca II H and K inner wing shapes. Possible sources of error in this semiempirical approach are evaluated. The derived hydrogen van der Waals broadening is compared with theoretical estimates of that broadening as well as with experimental measurements of the helium broadening
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