Other
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..427y&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. 427-436.
Other
40
Chromosphere, Dwarf Stars, H Alpha Line, Late Stars, M Stars, Stellar Radiation, Emission Spectra, Spectral Line Width, Stellar Coronas, Stellar Luminosity, X Rays
Scientific paper
Spectroscopic observations from three observatories are combined to study the properties of the excess H-alpha emission which characterizes the most chromospherically active subset of the M dwarf stars, known as the dMe stars. It is demonstrated that the excess H-alpha luminosity from these stars is a monotonically decreasing function of their (R-I) color, and evidence is presented which suggests that the product of the mean surface brightness and the mean filling factor of the emissive regions is essentially constant with color. Another significant result of the study is a linear correlation between the excess luminosity in H-alpha and the coronal X-ray luminosity.
Bopp Bernard William
Harlan Eugene
Skumanich Andrew
Stauffer John R.
Young Arthur
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