Sdss iii apogee apache point observatory galactic evolution experiment
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SDSS-III/ APOGEE (Apache Point Observatory Galactic Evolution Experiment). near-IR, high resolution spectroscopy of ~100,000 stars over 3 years, taking advantage of near-IR to focus on obscured regions (disk and bulge) when observable

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Sdss iii apogee apache point observatory galactic evolution experiment
SDSS-III/ APOGEE (Apache Point Observatory Galactic Evolution Experiment)

  • near-IR, high resolution spectroscopy of ~100,000 stars over 3 years, taking advantage of near-IR to focus on obscured regions (disk and bulge) when observable

  • Year 1 data available (SDSS DR10): includes metallicities for nearly 50000 stars

  • Radial metallicity gradients flatter in inner galaxy

  • Radial gradients flatter above the plane

  • Radial gradients steeper for low [alpha/M] stars

  • Vertical gradients flatten at larger radii

(Hayden, Holtzman et al., 2013; Anders, Chiappini et al., 2013)


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