NOAO >   Observing Info >   Approved Programs >   2006A-0254

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Proposal Information for 2006A-0254


PI: Guy Worthey, Washington State University, gworthey@wsu.edu
Address: Department of Physics and Astronomy, 1245 Webster Hall, Pullman, WA 99164-2814, USA

CoI: Jedidiah Serven, Washington State University

Title: Element by Element Abundances in Spheroidal Galaxies

Abstract: Element-by-element abundances will be derived from high quality long slit KPNO 4m spectra of nearby elliptical galaxies that span the range of velocity dispersion. Analysis of these spectra will give the abundances of 18 individual elements to bring to extragalactic astronomy the same luxurious situation now enjoyed only by stellar spectroscopists. These spectra will reveal the basic element ratio behavior as a function of galaxy velocity dispersion. For example, [Mg/Fe] is seen to be enhanced in large galaxies, but not small ones. We propose to expand our purview from 2 elements (Mg and Fe) to 18 elements. This, in turn, will tie directly to chemical evolution and chemical enrichment mechanisms. As a byproduct, we also decrease the stellar population age uncertainty by about a factor of ten from today's Balmer-metal index diagram techniques.


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NOAO >   Observing Info >   Approved Programs >   2006A-0254

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