Study of FK Comae Berenices II. Spot evolution from 1994 to 1997

We present new surface (Doppler) images of the late-type single giant FK Co rn for June-July 1996, July-August 1996, April 1997 and June 1997. These im ages are compared with the previously published images from 1994 and 1995. The consecutive maps are cross-correlated to see the possible migration of the spots and the effects of differential rotation. The cross-correlation c onfirms an average longitudinal spot migration of 0.22 +/- 0.03 in phase wi thin a year. This movement is probably an artifact caused by a difference b etween the accepted rotation period and the real photometric period for the se years. If this is true, then the photometric rotation period for these y ears is 2(d).4037 +/- 0.0005. Measurements from these four years and six ma ps limit the surface differential rotation to alpha = 0.0001 +/- 0.0002, wh ere alpha is the difference between polar and equatorial angular velocities relative to the equatorial angular velocity.