RACE-OC project: Rotation and variability of young stellar associations within 100 pc S. Messina, S. Desidera, M. Turatto, A. C. Lanzafame and E. F. Guinan A&A, 520 (2010) A15 Published online: 22 September 2010 DOI: 10.1051/0004-6361/200913644