A New Look At An Old Cluster: Age, Activity, And Rotation In NGC 752

Details A New Look At An Old Cluster: Age, Activity, And Rotation In NGC 752 A New Look At An Old Cluster: Age, Activity, And Rotation In NGC 752

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915125b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #151.25

Astronomy and Astrophysics

Astronomy

Scientific paper

Large uncertainties exist in our understanding of how stellar rotation and activity in Sun-like stars evolves after they reach the age of the Hyades, roughly 0.5 Gyr. Rotation periods are scarce for older stars, seriously complicating the calibration of an age-rotation-activity relation one can apply to field stars. The Palomar Transient Factory (PTF) survey of open clusters is an effort to map stellar rotation in nearby open clusters of different ages. We provide an update on our ongoing work on NGC 752, a 1-2 Gyr open cluster at a distance of only 450pc. We have completed a season of R-band PTF observations of two overlapping fields centered on the cluster. These observations spanned five months, included 400 separate epochs for each field, and produced over 50,000 light curves per field. Our preliminary results include updated membership information based on radial velocity measurements made from MDM and WIYN/Hydra spectra, an improved cluster age estimate based on isochrone fitting, and a sample of newly identified variable and periodic stars. As the closest known intermediate-age cluster, NGC 752 represents one of the best opportunities we have to study the age-rotation-activity relation in main sequence stars at ages near 1 Gyr.

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