KIC 5428626—New FK Com-Type Star Candidate

Abstract—According to the results of analysis of the Kepler space telescope photometric observations, we studied a star KIC 5428626, which was previously noted as a rapidly rotating giant with a flare activity. We have estimated the spottedness parameters $S$ of this object ($7$–$12$% of the area of the total visible surface of the star) and its differential rotation ($\Delta \Omega$ is $0.016$ rad/day). The positions (longitudes) of the dominant active region on the surface of the star were found and their evolution over time was traced: cyclic variations of the positions with a characteristic time of about $400$ days are possible. A similar conclusion has previously been made about the existence of cyclic variations in the positions of active regions of the star FK Com—the prototype of stars under study. KIC 5428626 has a high flare activity. The literature provides data on $143$ flares with the energy $\log E$ ranging from $34.8$ to $37.4$. Results of the study and data available in the literature allow us to consider KIC 5428626 as an attractive target for setting forth its possible belonging to the group of FK Com-type stars.