NOAO >   Observing Info >   Approved Programs >   2004A-0347

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Proposal Information for 2004A-0347


PI: Steven R. Majewski, University of Virginia, srm4n@virginia.edu
Address: Department of Astronomy, PO Box 3818, Charlottesville, VA 22903-0818, U.S.A.

CoI: Richard J. Patterson, U. Virginia
CoI: William E. Kunkel, Las Campanas Observatory
CoI: Jaehyon Rhee, CSA Yonsei U./Caltech
CoI: Timothy Beers, MSU
CoI: Verne Smith, UTEP
CoI: Douglas Geisler, U. Concepcion
CoI: K. Johnston, Wesleyan U.
CoI: J. Crane, U. Virginia
CoI: A. Polak, U. Virginia
CoI: P. Frinchaboy, U. Virginia
CoI: A. Kundu, Michigan State U.
CoI: W. Gieren, U. Concepcion
CoI: I. N. Reid, STScI

Title: Mapping the Structure, Dynamics and Chemistry of the Galactic Halo

Abstract: We propose to measure radial velocities, abundances, and gravities for halo and thick disk giant and HB star candidates identified through the Grid Giant Star Survey (GGSS), a now-completed, systematically assembled catalogue of V\lesssim17.5 giant and HB star candidates. Because M_V~-2, metal-poor giants at V$=$17 probe to >50 kpc, the final catalogue of ~70,000 giant and HB stars provides an unparalleled database for a study of the structure, \it substructure, and chemodynamics of the Milky Way and one that uniformly samples \it all sky directions. The GGSS field sizes and limiting magnitude are well matched for efficient surveying with the Hydra systems. This initial proposal requests time to probe about 10% of the 1302 GGSS fields, focusing on high latitude regions to begin mapping halo substructure and tying this to small-scale variations of the metallicity distribution function. We have already had great success in detecting networked streams, some with [Fe/H] <$-2.3 stars, in a pilot survey similar to that proposed. In this first proposal, we expect to net ~100 stars with [Fe/H]<-2 and dozens with [Fe/H]<-2.5. Long term status is requested to trace streams over a large angle, making them extremely useful probes of the Galactic potential.


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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