Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62..239c&link_type=abstract
Astronomy and Astrophysics, vol. 62, no. 1-2, Jan. 1978, p. 239-244.
Astronomy and Astrophysics
Astrophysics
18
Chromosphere, Late Stars, Line Spectra, Shock Heating, Stellar Atmospheres, Stellar Temperature, Acoustic Emission, Calcium, Convection, Emission Spectra, K Lines, Nonequilibrium Thermodynamics, Solar Spectra, Stellar Models, Velocity Distribution
Scientific paper
Recent predictions of the positions of stellar temperature minima are combined with a theory of the formation of Ca(+) resonance lines, and thus present observable tests of the shock wave heating theory of stellar chromospheres. Although the trend in the predicted line widths agrees with the trend in the observations, the quantitative agreement is only satisfactory for a solar-type star with log g 4 and T(eff) 6000 K. The theoretical minima of giant stars are located much deeper and the minima of cool dwarf stars are located much higher than the observations suggest. Possible explanations of this disparity are discussed.
Cram Lawrence E.
Ulmschneider Peter
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