2000A&A...359.1035L

We present new VLA radio observations of a sample of dMe stars in X, U, K, and Q bands (from 8.4 to 43GHz) obtained during an observing campaign in 1996 April-June. The aim of the project was to determine the spectral energy distributions of late-type dwarf flare stars to investigate the possible existence of an inversion of the spectrum slope at frequencies higher than 8GHz. We also tried to constrain the possible emission mechanism at radio frequencies. We have detections in X band (8.4GHz), for three sources (UV Cet, V 1054 Oph, and EV Lac), while all of our other measurements are upper limits. We discuss how the weak radio emission of some sources (e.g. AU Mic) and the coronal plasma properties deduced from X-ray observations constrain the coronal magnetic field properties.