Chemical Cartography with Apogee: Large-Scale mean Metallicity Maps of the Milky Way Disk
Hayden, Michael R; Holtzman, Jon A; Bovy, Jo; Majewski, S; Johnson, J A; Allende Prieto, Carlos; Beers, Timothy C; Cunha, Katia; Frinchaboy, Peter M; Garcia Perez, Ana Elia; Girardi, L; Schlesinger, Katharine
We present Galactic mean metallicity maps derived from the first year of the SDSS-III APOGEE experiment. Mean abundances in different zones of projected Galactocentric radius (0 < R < 15 kpc) at a range of heights above the plane (0 < |z| < 3 kpc), are derived from a sample of nearly 20,000 giant stars with unprecedented coverage, including stars in the Galactic mid-plane at large distances. We also split the sample into subsamples of stars with low- and high-[α/M] abundance ratios. We assess...[Show more]
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