Angular momentum evolution of cool stars: Toward a synthesis of observations and theory before and after the ZAMS

Abstract

The coexistence of fast and slowly rotating cool stars in ZAMS clusters - forming distinct sequences in the color vs. rotation period plane - is providing clues to differences in their pre main-sequence angular momentum evolution. This Cool Stars 17 splinter was dedicated to a discussion of new observational and theoretical results that may help discriminate between proposed mechanisms for early angular momentum regulation and help us explain the observed ZAMS dichotomy. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim