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G. Cutispoto, R. Pallavicini, M. Kuerster, and M. Rodono
We present high-precision UBV(RI)_c_ photometry for a small sample of cool stars detected at EUV wavelengths by the ROSAT WFC and/or the EUVE all-sky survey. Four out of the five stars observed are variable and one of them is an eclipsing binary. Amplitudes up to 0.38 magnitudes in the V band have been observed and clear colour variations have been found. We have computed the photometric periods and deduced approximate spectral classifications and distances.
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