A study on the flux-flux and activity-rotation relationships for late-type stars members of young stellar kinematic groups

We present here our ongoing study on the spectroscopic properties of young active stars members of the young moving groups Local Association (Pleiades moving group, 20-150 Myrs), IC 2391 supercluster (similar to 35 Myrs), Ursa Major group (Sirius supercluster, similar to 300Myrs), Hyades supercluster (similar to 600 Myrs) and Castor moving group (similar to 200 Myrs). High resolution echelle spectra of 144 late-type stars have been taken during several observing runs from 1999-2004. In this contribution we analyse the flux-flux and activity-rotation relationships for the chromospherically active stars of the sample. Each one of the optical chromospheric activity indicators from Ca II H & K to infrared triplet (IRT), including Balmer series, has been used. Both projected rotation (v sin i) determined by us and photometric period (P-phot) from the literature have been used in the activity-rotation relationship. We discuss the different behaviour of these relationships in groups of stars with different age and the dependence on stellar parameters of the saturated regime.