New Keck spectroscopy of 70 M31 red giants shows alpha-enhanced populations in the inner halo, Giant Stellar Stream, and outer disk, and suggests today's M31 satellites did not build the metal-rich inner halo.
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Elemental Abundances in M31: A Comparative Analysis of Iron and Alpha Element Abundances in the Outer Disk, Giant Stellar Stream, and Inner Halo of M31
New Keck spectroscopy of 70 M31 red giants shows alpha-enhanced populations in the inner halo, Giant Stellar Stream, and outer disk, and suggests today's M31 satellites did not build the metal-rich inner halo.