Nonthermal microwave phenomena in other stars

Several classes of 'normal' stellar objects exhibit microwave phenomena, predominantly at cm wavelengths. These include RS CVn binaries, Algol-type binaries, M supergiants, and UV Ceti-type flare stars. The emission mechanisms are generally either synchrotron or gyrosynchrotron radiation, with the latter being predominant in the numerous RS CVn radio emitters which sometimes exhibit variable circular polarization. 'Events' have time scales varying from minutes to days.