THE METAL-POOR HALO OF THE ANDROMEDA SPIRAL GALAXY (M31)

@article{Kalirai2006THEMH,
  title={THE METAL-POOR HALO OF THE ANDROMEDA SPIRAL GALAXY (M31)},
  author={J. Kalirai and K. Gilbert and P. Guhathakurta and S. Majewski and J. Ostheimer and R. Rich and M. Cooper and D. Reitzel and R. Patterson},
  journal={The Astrophysical Journal},
  year={2006},
  volume={648},
  pages={389-404}
}
We present spectroscopic observations of red giant branch (RGB) stars over a large expanse in the halo of the Andromeda spiral galaxy (M31), acquired with the DEIMOS instrument on the Keck II 10 m telescope. Using a combination of five photometric/spectroscopic diagnostics?(1) radial velocity, (2) intermediate-width DDO51 photometry, (3) Na I equivalent width (surface gravity-sensitive), (4) position in the color-magnitude diagram, and (5) comparison between photometric and spectroscopic [Fe/H… Expand
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