4. Interferometer observations of RS CVn binaries. Gunn A.G., Spencer R.E., Abdul Aziz H., Doyle J.G., Davis R.J. & Pavelin P.E., A & A, 1994, 291, 847. Compressed Postscript (37 kbytes) Compressed PDF (197 kbytes) ABSTRACT. We present radio flux measurements at 5 GHz for a sample of RS CVn-type chromospherically active binary systems made from 1988 to 1992 using the NRAL broad-band interferometer (BBI). The derived radio luminosities are consistent with previous observations but show that radio flaring is a common feature which will affect the results of rotation-activity studies. The mean brightness temperature for our sample, assuming a radio source size equal to twice the radius of the active stellar component, is consistent with a gyrosynchrotron emission process from mildly relativistic electrons.