Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...200..641m&link_type=abstract
Astrophysical Journal, vol. 200, Sept. 15, 1975, pt. 1, p. 641-645.
Astronomy and Astrophysics
Astrophysics
18
Energy Conversion, Starspots, Stellar Flares, Stellar Luminosity, Variable Stars, Astronomical Models, G Stars, Plasma Waves, Solar Flares, Stellar Radiation
Scientific paper
It is suggested that the energy released in stellar flares is provided by a steady accumulation of a fraction of the missing energy in starspots. The analysis is based on the assumption that starspots are necessary for flare activity since they are highly efficient generators of nonthermal energy. The rate of occurrence of flares of given absolute magnitude on a star of given absolute visual magnitude is determined, and an expression is obtained for the dependence of the cooling time of optically thick flare plasma on the absolute magnitude and gravity of a star. The results are found to be in excellent agreement with the observed statistical properties of stellar flares over a range of almost 10 magnitudes in intrinsic visual luminosity. It is noted that the formulas can be applied in an approximate way to solar flares and sunspots, and that the lack of flare stars in spectral types earlier than KO may mean that starspots become very small in late G-type stars.
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