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The light curves of solar-type stars present both periodic fluctuation andflare spikes. The gradual periodic fluctuation is interpreted as the rotationalmodulation of magnetic features on the stellar surface and is used to deducemagnetic feature activity properties. The flare spikes in light curves are usedto derive flare activity properties. In this paper, we analyze the light curvedata of three solar-type stars (KIC 6034120, KIC 3118883, and KIC 10528093)observed with Kepler space telescope and investigate the relationship betweentheir magnetic feature activities and flare activities. The analysis showsthat: (1) both the magnetic feature activity and the flare activity exhibitlong-term variations as the Sun does; (2) unlike the Sun, the long-termvariations of magnetic feature activity and flare activity are not in phasewith each other; (3) the analysis of star KIC 6034120 suggests that thelong-term variations of magnetic feature activity and flare activity have asimilar cycle length. Our analysis and results indicate that the magneticfeatures that dominate rotational modulation and the flares possibly havedifferent source regions, although they may be influenced by the magnetic fieldgenerated through a same dynamo process.

Activity Analyses for Solar-type Stars Observed with Kepler. II. Magnetic Feature Versus Flare Activity