Study of FK Comae Berenices - III. Photometry for the years 1993-2001

We present 8 years of previously unpublished photometric observations of FK Com together with the determination of the stability of the primary compar ison star HD 117567. The observations have been carried out between 1993 an d 2001 at four different observatories and they consist of 5157 data points in total: U(903), B(994), V(1643), R(166), I-c(573), b(461) and y(417). We also analyse this new data together with the previously published photomet ric observations. The V magnitude shows variations with dominant periods of about 3, 6, 12, 14 and 31 years. The short-term light curve variations app ear to be caused by rearrangement of approximately constant amount of cool spots. From the values for different colours obtained during the brightest season observed, corresponding to the supposedly unspotted surface, the spe ctral type of FK Com is determined to be G7 III.