Physics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..144i&link_type=abstract
NOAO Proposal ID #2009B-0144
Physics
Scientific paper
The rotation rate of a star can be measured to high precision by direct observation, and yet is a fundamental stellar property which can be used to probe evolutionary scenarios, including poorly-understood mechanisms such as magnetically-driven stellar winds and star-disc interaction on the pre-main-sequence. Although the available database of rotation periods has grown substantially in recent years, even for solar-mass stars the evolution in rotation rates is still poorly constrained in age range from ~ 10 to a few 100 Myr. The proposed observations aim to supplement this database by measuring periods for 100s of solar-type stars in the young open clusters NGC 2547 (~ 40 Myr) and NGC 2516 (~ 150 Myr). The resulting samples of periods will be ``cleaned'' of field contamination using proper motion measurements, and should place stringent constraints on rotational evolution models. The recently- proposed technique of ``gyrochronology'' is a particularly interesting application of these models, and promises to yield reasonably precise age estimates for field stars given only a measured color and rotation period.
Bouvier Jerome
Hebb Leslie
Irwin Jonathan
Scholz Aleks
Stassun Keivan
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