H and K wing emission lines in late-type stars

Details H and K wing emission lines in late-type stars H and K wing emission lines in late-type stars

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phdt.........1s&link_type=abstract

Ph.D. Thesis Michigan Univ., Ann Arbor.

Physics

1

Late Stars, Stellar Radiation, Calcium, Cool Stars, Iron, Line Spectra, Rare Earth Elements, Wavelengths

Scientific paper

The observation, empirical properties and interpretation, of spectral emission lines from metals and rare-earth elements which occur in the extensive wings of the resonance lines of singly-ionized calcium among cool stars were studied. The observations are discussed in terms of a study of nearly 1000 high-dispersion spectrograms of over 225 stars of spectral types F2 to M6 and all luminosity classes. It is concluded that the H-K wing emission lines do occur frequently among cool luminous stars, and the strength of their appearance is dependent on stellar luminosity aand possibly on atmospheric effects that asymmetrize the central emission profiles of the Ca II H and K lines.

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