Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124...43o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 1, July 1983, p. 43-49. Research supported by the Nederlandse Organis
Astronomy and Astrophysics
Astrophysics
32
Calcium, Emission Spectra, Faculae, K Lines, Solar Spectra, Stellar Spectrophotometry, Abundance, Main Sequence Stars, Solar Activity Effects, Solar Temperature, Spectral Energy Distribution, Spectral Line Width, Stellar Luminosity
Scientific paper
Ca II K line spectrograms of the full solar disk obtained in the Utrecht solar monitoring program from October, 1979 through mid-1982 are interpreted, and the results are extrapolated to stars of solar type. A mean plage emission profile (PEP) averaged over the solar disk and over time, a differential function independent of spectral resolution to the first order, is plotted for the wavelength range from 393.2800 to 393.4754 nm. The PEP is shown to remain essentially constant in shape, varying only in amplitude with solar activity, and hence to be a more adequate indicator of the plage contribution to the Ca II K line profile than the conventional line-core spectrum. The PEP is used to calculate line-core profiles for main-sequence stars of solar effective temperature: less active stars have simple absorption profiles without K2 peaks, while the surface of more active stars is covered up to 65 percent by plages. The Wilson-Bappu width is shown to be the most accurate indicator of luminosity, since it is least sensitive to stellar activity.
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