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Chemical Tagging with APOGEE: Discovery of a new old stellar population in the Galactic bulge

Ricardo Schiavon

Associated events

  • On Monday 15 January 2018 from 11:00 to 12:00

I will report the discovery by SDSS-III/APOGEE of a stellar population in the Galactic bulge field, whose abundance patterns resemble those of globular cluster stars. The newly discovered stars are homogeneously distributed across, and kinematically indistinguishable from, the dominant field population. The metallicity distribution of this new stellar population appears to be unimodal, peaking at [Fe/H]•–1, thus being in disagreement with that of the Galactic globular cluster system. I will conclude by discussing the nature of this new stellar population and the possible implications of this discovery for our understanding of the formation of the Milky Way.