AAS 207th Meeting, 8-12 January 2006
Session 135 A New Look at Andromeda
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[135.06] Chemical Abundance Patterns in Red Giant Branch Stars in the Andromeda Spiral Galaxy

C. Luine, J. S. Kalirai, K. M. Gilbert, P. Guhathakurta, R. C. Peterson (UCSC), R. M. Rich, D. B. Reitzel (UCLA), R. P. Schiavon, S. R. Majewski (UVa)

This paper presents high S/N spectra of red giant branch (RGB) stars in the Andromeda spiral galaxy (M31) obtained as part of our Keck/DEIMOS spectroscopic survey. The spectra cover the wavelength range \rm ~6500-9000Å and have a resolution (FWHM) of about \rm 1.3Å or R ~7000. We explore chemical abundance patterns among the most metal poor of M31's RGB stars. Stars are grouped according to their position in a color-magnitude diagram and their spectra are coadded to achieve higher S/N. The groupings are done separately for members of different structural components within M31: inner spheroid, outer halo, disk, giant southern stream, dwarf satellites, etc. This allows us to carry out a comparative study of the chemical enrichment histories of various subcomponents within M31.

P.G. acknowledges support from NSF grant AST-0307966. Data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among Caltech, the Univ of California and NASA. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation.

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