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.
- circumstellar matter stars: late-type stars: magnetic fields stars: pre-main sequence stars: rotation
Meibom, S., Barnes, S. A., Covey, K., Jeffries, R. D., Matt, S., Morin, J., Palacios, A., Reiners, A., Sicilia-Aguilar, A., & Irwin, J. (2013). Angular momentum evolution of cool stars: Toward a synthesis of observations and theory before and after the ZAMS. Astronomische Nachrichten, 334(1-2), 168-171. https://doi.org/10.1002/asna.201211777