Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...196..291h&link_type=abstract
Astrophysical Journal, vol. 196, Feb. 15, 1975, pt. 1, p. 291-305. Navy-supported research;
Astronomy and Astrophysics
Astrophysics
14
Environment Simulation, H Lines, Helium, K Lines, Spectral Line Width, Stellar Spectra, White Dwarf Stars, Astronomical Models, Atmospheric Models, Calcium, Fine Structure, Stellar Atmospheres
Scientific paper
Laboratory measurements of widths and shifts of the Ca II H and K lines have been made under conditions simulating those in the atmospheres of metallic-line white dwarfs, namely, densities of 10 to the 21st power helium atoms per cu cm and temperatures of 4500 to 6000 K. There are significant differences in the shifts and damping constants of the two fine-structure components. The impact theory is evidently applicable to the Ca II/He system under these conditions, and the observed damping constants are fortuitously close to the predictions of conventional Lindholm-Foley/van der Waals theory. The widths and shifts have also been analyzed in terms of Lennard-Jones potential theory.
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