Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.172..585e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 172, Sept. 1975, p. 585-602.
Astronomy and Astrophysics
Astronomy
45
Chromosphere, Coronas, Early Stars, Emission Spectra, F Stars, Stellar Spectra, Astronomical Models, Atmospheric Models, Lyman Alpha Radiation, Oxygen Spectra, Spectral Line Width, Stellar Atmospheres, Stellar Luminosity
Scientific paper
Results are reported for Copernicus satellite observations of the Ly-alpha, Si III, and O VI chromospheric emission lines of alpha CMi (Procyon, F5 IV). Mg II h and k emission was also detected in Procyon as well as in alpha Car (Canopus, FO Ib). A H I column density of the order of 1.6 by 10 to the 17th power per sq cm is derived from the Ly-alpha interstellar-absorption component, and a value of 0.015 atoms per cu cm is obtained for the neutral-hydrogen density in the solar neighborhood. The observed line widths of the Mg II emissions are used to evaluate the Wilson-Bappu correlation of line width with luminosity. Two models of Procyon's atmosphere are proposed on the basis of analysis of the emission-line intensities.
Evans R. G.
Jordan Cathy
Wilson Raymond
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