Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...39..415r&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 39, Mar. 1980, p. 415-422. Research supported by the National Research Counc
Astronomy and Astrophysics
Astrophysics
9
Emission Spectra, Line Spectra, Solar Limb, Solar Spectra, Calcium, Cool Stars, High Resolution, Hydrogen, Limb Darkening, Photosphere, Potassium, Solar Atmosphere, Spectral Resolution, Stellar Luminosity
Scientific paper
The paper employs solar observations of high spatial and spectral resolution to identify emission lines seen in the extended wings of Ca II H & K near the solar limb. Emission lines in the wings of H & K represent valuable diagnostics of the atmospheres of cool stars, with a varying information content which depends on their particular formation mechanism. In solar spectrograms different emission line formation mechanisms can be distinguished by the character of the spatial intensity variation (SIV) apparent in the lines. Various classes of H & K emission features, their spatial intensity variations and their formation mechanisms (of which some pose further problems) are discussed. A new extended list of line identifications is compiled based on their formation class and compared with other line lists. Evidence is found that stellar luminosity-sensitive lines tend to show large spatial intensity variation on the sun.
Rutten Robert J.
Stencel Robert E.
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