Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109...90s&link_type=abstract
Astronomy and Astrophysics, vol. 109, no. 1, May 1982, p. 90-94. Research supported by the Consiglio Nazionale delle Ricerche a
Astronomy and Astrophysics
Astrophysics
3
Calcium, Emission Spectra, K Lines, Late Stars, Spectral Line Width, Stellar Models, Atmospheric Turbulence, Chromosphere, Line Spectra, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
Consideration is given to the parameters controlling the widths of the emission core in the Ca II K line found in most late-type stars. A model of Ca II K core formation which takes into account partial redistribution effects in the scattering process is developed and used to calculate emission widths as a function of a limited set of stellar parameters. It is found that the K2 peak separation and the full width at half maximum of the core feature depend essentially on the amplitude of chromospheric turbulent velocities, while the K1 dip separation depends on partial redistribution effects as well as turbulent velocity amplitude. Results also cast doubt on the previously claimed dependence of the K1 dip on the square root of the temperature minimum.
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