NOAO >   Observing Info >   Approved Programs >   2006B-0064

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Proposal Information for 2006B-0064


PI: Bruce W. Carney, University of North Carolina, bruce@unc.edu
Address: Dept. of Physics & Astronomy, CB \#3255, Chapel Hill, NC 27599-3255, USA

CoI: David W. Latham, Center for Astrophysics
CoI: John B. Laird, Bowling Green State University
CoI: David Yong, University of North Carolina

Title: The Chemical History of the Monoceros Ring

Abstract: We propose to use Hydra on the WIYN telescope to observe candidate red giant members of the Monoceros Ring, in order to explore the chemical history of that star stream compared to other outer disk stars and clusters. The system has a well-defined radial velocity (Yanny et al. 2003, 2004) which we may compare to those derived for our target stars. By comparing the observed spectra with a large grid of synthetic spectra, we will also derive good estimates for gravity and chemical composition, including both [Fe/H] and [(alpha)/Fe]. If the Monoceros Ring is a merger event, we expect to discern unusual [(alpha)/Fe] vs.\ [Fe/H] behavior at the velocity of the structure.


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