NOAO >   Observing Info >   Approved Programs >   2002B-0066

Small NOAO Logo

Proposal Information for 2002B-0066


PI: Luisa Rebull, SIRTF Science Center, rebull@ipac.caltech.edu
Address: 1200 California Blvd, Pasadena, CA 91125, USA

CoI: Steven Strom, NOAO
CoI: John Stauffer, IPAC/SIRTF Science Center/Caltech
CoI: Sidney Wolff, NOAO
CoI: David Cole, JPL/Caltech

Title: Rotational Evolution of Young Low-Mass Stars in the Orion Nebula Cluster

Abstract: A fundamental problem in star formation is determining when and how PMS stars shed their angular momentum. Recent observations (Rebull \etal 2002) seem to show that pre-main sequence stars in Orion, whether or not they have near-infrared excesses consistent with disks, evolve at constant angular velocity-not constant angular momentum-thereby indicating that a powerful loss mechanism is at work during the first few million years of their evolution. This surprising result needs to be tested in more detail by: 1) adding to the sample stars that populate the extremes of the convective tracks so as to obtain the greatest leverage on the expected changes in angular momentum; 2) determining whether stellar radii (R) can be determined accurately enough to be used as an age indicator; 3) obtaining radial velocities in order to check for binarity; and 4) extending v \sin i measurements to regions beyond the ONC to lower density environments.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2002B-0066

noaoprop-help@noao.edu

Small NOAO Logo