The Columbia/Cornell/Caltech Palomar Transient Factory (CCCP) Praesepe Campaign: Studying the Rotation-Activity Relation in an Intermediate Age Cluster

Details The Columbia/Cornell/Caltech Palomar Transient Factory (CCCP) Praesepe Campaign: Studying the Rotation-Activity Relation in an Intermediate Age Cluster The Columbia/Cornell/Caltech Palomar Transient Factory (CCCP) Praesepe Campaign: Studying the Rotation-Activity Relation in an Intermediate Age Cluster

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715306c&link_type=abstract

American Astronomical Society, AAS Meeting #217, #153.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

For several decades, observational surveys have demonstrated a closerelationship between a star's rotation period, magnetic activity, and age. The age-activity-rotation relation is well documented in clusters younger than 500 Myrs, but its subsequent evolution is less clear. Using wide-field, multi-epoch photometry from the Palomar Transient Factory, we have monitored 530 members of the Praesepe open cluster, a 600 Myr nearby Hyades analog. With light curves containing >150 measurements over more than three months, we have measured rotation periods for 50 K & M-type cluster members. These rotation periods span the gap between the periods measured for solar-type Hyads and the lowest-mass Praesepe members, and indicate that the orderly mass-rotation relation seen for higher mass Praesepe members begins to break down at 0.6 Msun. Below this critical mass, a range of rotation periods spanning an order of magnitude are observed for stars with similar masses. Combining these rotation measurements with archival X-ray and Halpha observations completes the portrait of the 600 Myr age-activity-rotation relation, and enables a detailed comparison with Praesepe's sister cluster, the Hyades.

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