NOAO >   Observing Info >   Approved Programs >   2010A-0378

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Proposal Information for 2010A-0378


PI: Jason T. Wright, Penn State University, jtwright@astro.psu.edu
Address: Astronomy Department, 525 Davey Lab, University Park, PA 16802, USA

Title: Determining Distance, Age, and Activity in a New Benchmark Cluster: Ruprecht 147

Abstract: This proposal seeks 1 night of time on Hectochelle to observe the F, G, and K dwarfs of Ruprecht 147, recently identified as the closest old stellar cluster. At only ~ 200 pc and at an age of ~ 1-2 Gyr, this will be an important benchmark in stellar astrophysics, providing the only sample of spectroscopically accessible old, single, late-type stars of determinable age. Hectochelle is the ideal instrument to study this cluster, with a FOV, fiber count, and telescope aperture well matched to the cluster's diameter (~ 1^\circ), richness (~ 100 identified members), and distance modulus (6.5-7 mag., putting the G and K dwarfs at B=11-15). Hectochelle will measure the \caii line strengths of members to establish, for the first time, the chromospheric activity levels of a statistically significant sample of single F, G, and K dwarfs with well known ages near 2 Gyr.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2010A-0378

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