NOAO >   Observing Info >   Approved Programs >   2006A-0268

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Proposal Information for 2006A-0268


PI: David L. Lambert, University of Texas at Austin, dll@astro.as.utexas.edu
Address: Department of Astronomy, 1 University Station, C1400, Austin, TX 78712-0259, USA

CoI: Nils Ryde, Uppsala University
CoI: Kenneth Hinkle, NOAO
CoI: Verne V. Smith, NOAO
CoI: Bengt Gustafsson, Uppsala University
CoI: Bengt Edvardsson, Uppsala University
CoI: Martin Asplund, Australian National University
CoI: Sveneric Johansson, Lund Universtiy
CoI: Rurik Wahlin, Uppsala University

Title: Getting a handle on the origin of the Galactic Bulge

Abstract: The origin, chemical properties, and evolution history of the Galactic Bulge remain poorly understood. Abundance ratios of bulge stars, especially in the [(alpha)/Fe] vs [Fe/H] diagram, serve to constrain the evolutionary models. Measuring, for instance, a high (alpha) over-abundance indicates rapid and early star-formation. Thus, we propose an infrared based study of the (alpha) elements, including oxygen, of ten stars in two low-extinction windows towards the bulge. We will also re-investigate the oxygen abundance trends found from optical spectra of K giants in Baade's window by McWilliam & Rich (2004), which indicate a surprising cession of oxygen production in the bulge for metallicities larger than -0.5. The infrared, with lower extinction and molecular rather than atomic abundance indicators, is a preferred wavelength region to study abundances in bulge stars.


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