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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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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.