Chemical Tagging with APOGEE: Discovery of a population of stars with globular cluster chemical compositions in the field of the galactic bulge

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• Ricardo Schiavon (Liverpool John Moores University)
• Tuesday 17 November 2015, 14:00-15:00
• Martin Ryle Seminar Room, Kavli Institute.

If you have a question about this talk, please contact David Titterington.

I will report the discovery of a population of galactic bulge field stars with chemical compositions that are typical of globular cluster stars by SDSS -III/APOGEE. The newly discovered stars are homogeneously distributed across, and kinematically indistinguishable from, the rest of the bulge. 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, being on average more metal-rich than the halo clusters, and on average more metal-poor than those in the bulge and disk. Besides providing a brief description of APOGEE (Apache Point Observatory Galactic Evolution Experiment) survey and data, I will briefly discuss the possible scenarios that may explain the origin of these stars.

This talk is part of the Cavendish Astrophysics Seminars series.

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• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
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