VLA observation of dMe stars

We present new VLA radio observations of a sample of dMe stars in X, U, K, and Q bands (from 8.4 to 43 GHz) obtained during an observing campaign in 1 996 April-June. The aim of the project was to determine the spectral energy distributions of late-type dwarf flare stars to investigate the possible e xistence of an inversion of the spectrum slope at frequencies higher than 8 GHz. We also tried to constrain the possible emission mechanism at radio f requencies. We have detections in X band (8.4 GHz), for three sources (UV G et, 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 constra in the coronal magnetic field properties.