Modelling the chemical evolution of Zr, La, Ce, and Eu in the Galactic discs and bulge

Research output: Contribution to journalArticle

Abstract

We study the chemical evolution of Zr, La, Ce, and Eu in the Milky Way discs and bulge by means of chemical evolution models compared with spectroscopic data. We consider detailed chemical evolution models for the Galactic thick disc, thin disc, and bulge, which have been already tested to reproduce the observed [α/Fe] versus [Fe/H] diagrams and metallicity distribution functions for the three different components, and we apply them to follow the evolution of neutron capture elements. In the [Eu/Fe] versus [Fe/H] diagram, we observe and predict three distinct sequences corresponding to the thick disc, thin disc, and bulge, similar to what happens for the α-elements. We can nicely reproduce the three sequences by assuming different time-scales of formation and star formation efficiencies for the three different components, with the thin disc forming on a longer time-scale of formation with respect to the thick disc and bulge. On the other hand, in the [X/Fe] versus [Fe/H] diagrams for Zr, La, and Ce, the three populations are mixed and also from the model point of view there is an overlapping between the predictions for the different Galactic components, but the observed behaviour can be also reproduced by assuming different star formation histories in the three components. In conclusions, it is straightforward to see how different star formation histories can lead to different abundance patterns and also looking at the abundance patterns of neutron capture elements can help in constraining the history of formation and evolution of the major Galactic components.

Details

Authors
Organisations
External organisations
  • University of Trieste
  • INAF Astronomical Observatory of Trieste
  • INFN Section of Trieste
  • Malmö University
  • The French National Centre for Scientific Research (CNRS)
  • University of Côte d'Azur
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Galaxy: abundances, Galaxy: evolution
Original languageEnglish
Pages (from-to)2828-2834
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume492
Issue number2
Publication statusPublished - 2020 Feb
Publication categoryResearch
Peer-reviewedYes