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VLBI measurement of the size of dMe stars.

The binary system YY Gem, which consists of two dM1e stars, has been observed during an eclipse using intercontinental Very Long Baseline Interferometry (VLBI) at 1.6 GHz. The stellar emission was at a low, quiescent level at all observing periods. The correlated flux decreases slightly with baseline length, indicating that the source is resolved at the longest baselines. This is confirmed by model fits, which give a FWHM size of 0.94(±0.24) mas (2.0·1011cm or 2.1 photospheric diameters) for the radio emitting source. A lower limit to the size derived from the lack of observable eclipse effects is consistent with this value. The resulting brightness temperature of 1.1 · 109 K is compatible with gyrosynchrotron emission. Deviations from circular symmetry are not significant. The loops that trap the radio emitting electrons reaching an altitude of probably more than a stellar radius appear to be distributed isotropically within the limits of the resolution.