NOAO >   Observing Info >   Approved Programs >   2013B-0544

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Proposal Information for 2013B-0544


PI: Andrew Stephens, Gemini Observatory, astephens@gemini.edu
Address: Gemini Observatory, 670 N. Aohoku Place, Hilo, HI 96720, USA

CoI: Ricardo Schiavon, Liverpool John Moores University
CoI: Nelson Caldwell, Harvard-Smithsonian Center for Astrophysics
CoI: Katia Cunha, Observatorio Nacional (ON/MCT)
CoI: Matthew Shetrone, University of Texas
CoI: Carlos Allende Prieto, Instituto Astrofisico de Canarias
CoI: Verne Smith, NOAO

Title: CNO Abundances in Resolved M31 Globular Cluster Stars

Abstract: We propose to exploit the outstanding sensitivity of GNIRS with Altair to obtain high S/N, medium-resolution JHK spectra of individual stars from one old globular cluster in the Andromeda galaxy. We will then determine, for the first time, elemental abundances in individual old M31 stars. We also expect to detect, for the first time, the presence of multiple stellar populations in an M31 cluster. The C, N, and O abundances determined in this pilot project will pose important preliminary constraints on the history of star formation of the M31 halo. Comparing our abundances to those of young M31 disk stars, we will obtain a first assessment of the chemical evolution of M31 over the past 10 billion years. A possible detection of multiple stellar populations will provide preliminary tests of model predictions for cluster formation.


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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