NOAO >   Observing Info >   Approved Programs >   2001A-0247

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Proposal Information for 2001A-0247


PI: Suchitra Balachandran, University of Maryland, suchitra@astro.umd.edu
Address: College Park, MD 20742, USA

CoI: John Carr, Naval Research Laboratory
CoI: Bruce Carney, University of North Carolina

Title: Oxygen abundances in metal-poor stars from IR-OH lines

Abstract: The goal of this project is to examine the evolution of oxygen in the early Galaxy by measuring IR-OH lines in metal-poor stars. Oxygen is critical to numerous astrophysical contexts including the derivation of globular cluster ages and the early history of the Galaxy's chemistry. However, its abundance, particularly in metal-poor stars, has been controversial, with different abundance indicators suggesting either a flat [O/Fe] ratio or one that increases as metallicity decreases. The IR vibrational-rotational OH lines provide a robust alternative to previous indicators and is the only diagnositc that can be applied to both dwarfs and giants. The end result of our observations will be a good characterization of the evolution of this important element.


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NOAO >   Observing Info >   Approved Programs >   2001A-0247

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