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Chemical Cartography in the Milky Way with SDSS/APOGEE


Prof. Jon Holtzman
Fundacion Jesus Serra


March 14th, 2019

Abstract

The SDSS Apache Point Observatory Galactic Evolution 
Experiment (APOGEE) has
collected high resolution near-IR spectra of several hundred thousand stars
across the Milky Way. I'll describe some observational results about the
spatial variation of chemical abundances as a function of Galactocentric
radius and distance from the midplane, discussing mean abundances, 
metallicity
distribution function, and the variation of abundance ratios of multiple
elements. Additional information related to stellar ages can be obtained
from [C/N] for red giant stars. Several lines of evidence suggest that 
radial
migration has had a significant impact on the Galactic disk. The 
observed patterns of
abundance ratios may provide observational constraints on 
nucleosynthetic yields.