NOAO >   Observing Info >   Approved Programs >   2006A-0162

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Proposal Information for 2006A-0162


PI: Robert D. Mathieu, University of Wisconsin - Madison, mathieu@astro.wisc.edu
Address: Astronomy Department, 475 N. Charter Street, Madison, WI, USA

CoI: Imants Platais, Johns Hopkins University
CoI: David W. Latham, Harvard-Smithsonian CfA
CoI: Guillermo Torres, Harvard-Smithsonian CfA
CoI: Andrew H. Szentgyorgyi, Harvard-Smithsonian CfA
CoI: Aaron Geller, University of Wisconsin - Madison
CoI: Ella Braden, University of Wisconsin - Madison

Title: The WIYN Open Cluster Study: New Astrophysics from Old Open Clusters

Abstract: This proposal is part of a project to establish comprehensive and reliable membership information for four rich, old open clusters (NGC 2506, NGC 2682, NGC 6791, and NGC 7789) using accurate space motions. For each cluster we will provide highly reliable three-dimensional kinematic membership determinations for the entire evolved cluster population; excellent two-dimensional kinematic membership determinations for cluster members to masses as low as 0.5 M_\odot; and a complete census of the short-period binary population among the solar-type stars, with orbital solutions for periods up to 10^3 days. As one scientific outcome, our radial-velocity surveys will lay the foundation for studies of the dynamical evolution of cluster binary populations and for an exploration of the interplay between stellar evolution and stellar dynamics, as traced by "anomalous" stars that cannot be explained by single-star evolutionary theory. This is a program integrating the Mayall 4-m for astrometric imaging with the WIYN 3.5m/Multi-Object Spectrograph and the MMT/Hectochelle for high- precision radial-velocities. Here we request time with MMT/Hectochelle to obtain radial velocities of faint stars in the crowded cores of the more distant clusters in our sample, NGC 2506, NGC 6791, and NGC 7789.


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



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