Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5109g&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #51.09; Bulletin of the American Astronomical Society, Vol. 24, p.1206
Astronomy and Astrophysics
Astronomy
Scientific paper
We have studied the relation between the quiescent radio and X-ray luminosities L_6cm and L_X of a variety of late-type active stars (M and K dwarfs, BY Dra binaries, RS CVn binaries, Algol binaries, FK Comae stars, weak-lined T Tau stars). We find a general relation logL_X <= logL_R + 15.5 that is valid over 6 orders of magnitude in luminosity. RS CVn's, Algols, FK Com stars, and WTTS tend to be ``microwave-rich''. This relation points to an intimate connection between the nonthermal, energetic electrons causing the radio emission and the coronal bulk plasma responsible for thermal X-rays. We have tested the hypothesis that particles accelerated in quasi-continuous flare-like processes emit synchrotron radiation during their lifetime and finally lose energy in collisions, thereby heating the coronal plasma. This scenario requires commonly assumed values for the magnetic field strength (100 G) and produces acceptable electron lifetimes.
Benz Arnold O.
Güdel Manuel
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