Abstract
Radio observations at 3.6, 6, 18 and 20 cm were made of the late-type giant FK Com using the VLA in US. Emission at mJy level was detected but no circular polarization was found. Fitting with a thermal model was not successful: for an electron density of 9 × 10 8cm −3 and a temperature of 5 × 10 7 K, the observed flux would require an emitting radius of 120 R ⊙, which seems unlikely, and the predicted X-luminosity in 2 orders of magnitude higher than was observed by the Einstein Observatory. The radio and X luminosities of FK Com are close to those of RS CVn systems. If the radio emission is produced by relativistic electrons, then the observed flux can be produced by a body with a 10 G magnetic field at a radius of 3R ⊙.
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