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The AMBRE Project: r-process element abundances in the Milky Way thin and thick discs

Published online by Cambridge University Press:  07 March 2018

Guillaume Guiglion ,
Patrick de Laverny ,
Alejandra Recio-Blanco  and
C. Clare Worley
Guillaume Guiglion
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP) An der Sternwarte 16, 14482 Potsdam email: gguiglion@aip.de
Patrick de Laverny
Affiliation:
Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, France
Alejandra Recio-Blanco
Affiliation:
Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, France
C. Clare Worley
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Rise, Cambridge CB3 0HA, UK
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Abstract

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Chemical evolution of r-process elements in the Milky Way disc is still a matter of debate. We took advantage of high resolution HARPS spectra from the ESO archive in order to derive precise chemical abundances of 3 r-process elements Eu, Dy & Gd for a sample of 4 355 FGK Milky Way stars. The chemical analysis has been performed thanks to the automatic optimization pipeline GAUGUIN. Based on the [α/Fe] ratio, we chemically characterized the thin and the thick discs, and present here results of these 3 r-process element abundances in both discs. We found an unexpected Gadolinium and Dysprosium enrichment in the thick disc stars compared to Europium, while these three elements track well each other in the thin disc.

Keywords

stars: abundancestechniques: spectroscopicGalaxy: abundancesGalaxy: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 216 - 217
Copyright
Copyright © International Astronomical Union 2018 

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