Computer Science
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..183b&link_type=abstract
NOAO Proposal ID #2001B-0183
Computer Science
Scientific paper
The study of stellar rotation provides unique insights into the interiors of stars, their magnetic fields, the winds that blow from their surfaces, and the interaction between the young star and its circumstellar disk. Sophisticated theoretical models already developed make definite and testable predictions of how the rotation rates of stars change with mass and age. At the present time, the models are ahead of the data because sufficient observations are not available to constrain them. But if observations do become available to compare with theory, they are likely to lead to fundamental insights about both the interiors and immediate exteriors of stars, including star-disk interaction. The most urgent need at the present time is for measurements in a cluster with age between those of the young (<=100 Myr) and the Hyades (<=600 Myr) clusters and one beyond. We are currently acquiring a superb dataset at YALO for the 900 Myr-old cluster NGC 5822. We therefore propose to complete the picture by determining, from precise CCD photometry, rotation periods for a group of solar-type (G, K and M type) stars in the 350 Myr-old open cluster NGC 6494. This cluster could not be observed in the last cycle because of bulge access issues; we are hoping for post-bulge access.
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