NOAO >   Observing Info >   Approved Programs >   2006A-0537

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Proposal Information for 2006A-0537


PI: Verne V. Smith, NOAO, vsmith@noao.edu
Address: NGSC, 950 N. Cherry Ave., Tucson, AZ 85726, USA

CoI: David L. Lambert, University of Texas at Austin
CoI: Martin Asplund, Mt. Stromlo Observaotry, Weston, Australia
CoI: Poul E. Nissen, Aarhus University, Aarhus, Denmark

Title: Isotopic Lithium Abundances in Very Metal-Poor Halo Stars

Abstract: In our continuing work on ^6Li and ^7Li isotopic abundances in Galactic halo stars, we have boosted the number of positive ^6Li detections in such stars from the previous single case to at least ten. No doubt the most exciting result stemming from our program is a detection of ^6Li in LP815-43, one of the most metal-poor stars in our sample ([Fe/H]=-2.7). If high ^6Li abundances at low [Fe/H] is a general feature, it would have important ramifications for light element production in the early Universe, Li depletion in metal-poor stars, Big Bang nucleosynthesis and possibly even non-standard particle physics. We here request Gemini-S/bHROS time to observe a sufficiently large sample of very metal-poor stars to test whether such a ^6Li plateau indeed exists.


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



NOAO >   Observing Info >   Approved Programs >   2006A-0537

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