The photometric variability of sun-like stars: Observations and results, 1984-1995

Using differential Stromgren b, y photometry, we monitored the brightness variations of 41 program stars and their 73 comparison stars from 1984 through 1995. The predominantly main-sequence program stars spanned ranges of temperature and mean chromospheric activity centered on solar values. About 40% of all the stars showed measurable variability, typically at levels below 0.01 mag (similar to 1%), on both night-to-night and year-to-year timescales. The variability correlated with mean chromospheric activity and advancing spectral type. We present differential light curves and statistical descriptions of our observations.