Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715229c&link_type=abstract
American Astronomical Society, AAS Meeting #217, #152.29; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astrophysics
Scientific paper
Ruprecht 147 is a hitherto unappreciated open cluster that holds great promise as a standard in fundamental stellar astrophysics. At 200 pc and an age of 2 Gyr, it is the closest old cluster by factor of more than 2 in each dimension. Two previously published member lists in the literature have either completely misidentified, or have only partially identified, the cluster's stellar population. We are amidst a multi-telescope campaign to characterize R147 and catalog its members and prove its benchmark status. We have identified over 100 members including 5 blue stragglers, obtained first epoch astrometry, and derived four-color optical photometry of the cluster core (CFHT/MegaCam) . The K and M dwarfs of Ruprecht 147 will be the only old, single, cool dwarfs with known ages bright enough to admit close spectroscopic study (so far, Ca II H&K with MMT/Hectochelle).
Curtis Jason L.
Wright Jason T.
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