Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..209c&link_type=abstract
NOAO Proposal ID #2008B-0209
Physics
Scientific paper
We propose to use MMT/Hectospec for Magellan/IMACS to measure spectral types of those members of the young stellar cluster NGC 2264 with known rotation periods and undetermined spectral types in order to construct a very clean sample of M3 and later type stars. We will use this sample, in combination with Spitzer data from our Cycle-5 program, to study the role circumstellar disks play in the angular momentum evolution of very low-mass, pre-main-sequence stars. This project is a continuation of our study of disk regulation in higher mass stars (M2.5 and earlier types), in which we have shown an unambiguous correlation between stellar rotation and the presence of a circumstellar disk. There is a sharp break in the behavior of rotation period distributions for stars earlier and later than type M2.5, suggesting a significant change in the efficiency or nature of the angular momentum transfer mechanism at this boundary. Our main goals are to establish whether or not disk regulation is operating in low-mass stars and to investigate any differences between the star-disk interaction parameters of high- mass and low-mass stars.
Baliber Nairn
Cieza Lucas
Fabricant Daniel
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