NOAO >   Observing Info >   Approved Programs >   2010B-0477

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Proposal Information for 2010B-0477


PI: Jennifer Johnson, Ohio State University, jaj@astronomy.ohio-state.edu
Address: Department of Astronomy, 140 W. 18th Ave, Columbus, OH 43210, USA

CoI: Katharine Schlesinger, Ohio State University
CoI: Jessica Orwig, Ohio State University

Title: The Metallicity of the Halo: Calibration of M giants

Abstract: The metal-rich end of the halo metallicity distribution function is poorly known, but of great interest, because it is related to the metallicities of the satellite galaxies that merged to become part of the Milky Way halo. While halo M giants have been identified for decades, their metallicities are essentially unknown because of the difficulty of modeling their spectra, although to be M giants they should have [Fe/H] \gtrsim -1. We propose to use M giants in globular clusters with known metallicities, distances, and reddenings to calibrate spectral indices based on molecular features. These indices can then be used to determine the properties of M giants in the halo.


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NOAO >   Observing Info >   Approved Programs >   2010B-0477

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