Activity and Rotation in the Young Cluster h Per | Costanza Argiroffi (Universita` degli studi di Palermo )

We study the rotation-activity relationship for low-mass members of the young cluster h Persei (~13 Myr). h Per, thanks to its age, allows us to link the rotation-activity relation observed for main-sequence stars to the puzzling case of very young PMS stars. We constrained the activity levels of h~Per members by analyzing a deep Chandra/ACIS-I observation pointed to the central field of h Per. Considering also the catalog of h Per members with measured rotational period, presented by Moraux et al. (2013), we obtained a final catalog of 202 h Per members with measured X-ray luminosity and rotational period. We investigate the rotation-activity relation of h Per members considering different mass ranges. We find that stars with 1.3 Msun < M < 1.4 Msun show significant evidence of supersaturation for short periods. This phenomenon is instead not observed for lower mass stars.