Cool Stars 14 - Submitted Abstract # 259 This version created on 05 October 2006 A Theoretical Investigation on Stellar Magnetic Activity in AB Dor Gaetano Belvedere, Dept. Physics and Astronomy Catania University Italy Alfio Bonanno, INAF Catania Astrophysical Observatory Italy Following our previous theoretical works on advection-dominated solar dynamo, we study the onset and topology of cyclic magnetic activity in stars different from the Sun.In detail, we are interested to the determination of cycle periods, production of butterfly diagrams and study of the sign of the current helicity as a function of the dynamo number, with both poleward and equatorward meridional circulation. In particular, we apply our investigation to the case of the fast rotating star AB Dor. ----------------------------------