Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21813301c&link_type=abstract
American Astronomical Society, AAS Meeting #218, #133.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astrophysics
Scientific paper
Ruprecht 147 has recently been identified as the nearest old cluster, theoretically enabling it to serve as an important benchmark for fundamental stellar astrophysics. Past attempts at characterization have been hindered by a limited (and in one case, a completely erroneous) membership list and poor photometry. We have conducted a radial velocity survey of candidates with MMT/Hectochelle and identify high-confidence members. We have obtained deep CFHT/MegaCam g'r'i'z' photometry, and combined with archival 2MASS JHK photometry, we perform a 7-band isochrone fit to break the degeneracy between extinction and distance to constrain the age, using the tau-squared maximum-likelihood procedure of Naylor & Jefferies (2007). We are working to publish and disseminate online our catalog of cluster and stellar properties, offering the community several new avenues for research in stellar astrophysics.
Curtis Jason L.
Wright Jason T.
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