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Observations of various solar-type stars along decades revealed that they canhave magnetic cycles, just like our Sun. An investigation of the relationbetween their cycle length and rotation period can shed light on the dynamomechanisms operating in these stars. Previous works on this relation suggestedthat the stars could be separated into active and inactive branches, with theSun falling between them. In this work, we determined short magnetic activitycycles for 6 active solar-type stars observed by the Kepler telescope. Themethod adopted here estimates the activity from the excess in the residuals ofthe transitlight curves. This excess is obtained by subtracting a spotlessmodel transit from the light curve, and then integrating over all the residualsduring the transit. The presence of long term periodicity is estimated from theanalysis of a Lomb-Scargle periodogram of the complete time series. Finally, weinvestigate the rotation-cycle period relation for the stars analysed here andfind that some active stars do not follow the behaviour proposed earlier,falling in the inactive branch. In addition, we also notice a considerablespread from other stars in the literature in the active/inactive branches.

Using planetary transits to estimate magnetic cycles lengths in Kepler stars