Searching for chromospheric activity cycles in FGK stars from HARPS data base

M. FLORES; M. JAQUE ARANCIBIA; C. SAFFE; P. MIQUELARENA

La Serena

Congreso; The Second Binational Meeting AAA-SOCHIAS; 2018

Sociedad Chilena de Astronomía, Asociación Argentina de Astronomía

Currently, the monitoring of many stars showing magnetic cycles could help for better understanding their dependence with the stellar properties and the place occupied by the Sun in this context. Up to now, therer are many questions related with the solar cycle (e.g. amplitude, shape and length cycle fluctuations, see Charbonneau 2010, Hathaway 2010, for details), wich could be addressed if the number of stellar activity cycles detcted in solar analogues and solar twin stars were increased.We performed a search for chromospheric activity cycles of 600 FGK-type stars from HARPS data base. To do so, we calculate the Mount Wilson index (Smw) for each object and then the corresponding temporal series were individually analyzed by using the generalized Lomb-Scargle periodogram. As well as the search for periodicities, we want to characterize the variability types of this overall sample.