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abstract
Between late 1980 and early 1992, we obtained differential Str\"{o}mgren b and y photometric observations of 13 Hyades stars, spectral types F5V to K4V. The observations achieved and sustained millimagnitude precision. All ten G and K-type stars in the sample showed variability on time scales ranging from days to years. Rotational modulation proved to be a prominent and persistent component of the variation of these stars on the seasonal time scale. Correlated brightness and b-y color variations were found from year to year. There was, however, no significant correlation seen between the amplitudes of
