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We present photometric spot modeling of the nearly four-year long light-curveof the Kepler target KIC 5955122 in terms of persisting dark circular surfacefeatures. With a Bayesian technique, we produced a plausible surface map thatshows dozens of small spots. After some artifacts are removed, the residualsare at $\pm 0.16$\,mmag. The shortest rotational period found is $P = 16.4 \pm0.2$ days. The equator-to-pole extrapolated differential rotation is $0.25 \pm0.02$ rad/d. The spots are roughly half as bright as the unperturbed stellarphotosphere. Spot latitudes are restricted to the zone $\pm 60^\circ$ latitude.There is no indication for any near-pole spots. In addition, the p-modepulsations enabled us to determine the evolutionary status of the star, theextension of the convective zone, and its radius and mass. We discuss thepossibility that the clear signature of active regions in the light curve ofthe F9IV star KIC 5955122 is produced by a flux-transport dynamo action at thebase of the convection zone. In particular, we argue that this star has evolvedfrom an active to a quiet status during the Q0--Q16 period of observation, andwe predict, according to our dynamo model, that the characteristic activitycycle is of the order of the solar one.

Magnetic activity, differential rotation and dynamo action in the pulsating F9IV star KIC 5955122