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

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 recent 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 [$\alpha$/Fe] vs [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] vs [Fe/H] diagram, we observe and predict three distinct sequences corresponding to the thick disc, thin disc and bulge, similarly to what happens for the $\alpha$-elements. We can nicely reproduce the three sequences by assuming different timescales of formation and star formation efficiencies for the three different components, with the thin disc forming on a longer timescale of formation with respect to the thick disc and bulge. On the other hand, in the [X/Fe] vs [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.

8 pages, 2 figures. Accepted for publication in MNRAS

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• On the variation of carbon abundance in galaxies and its implications
• The Pristine survey XIII: Uncovering the very metal-poor tail of the thin disc
• Fluorine in the solar neighborhood: modelling the Galactic thick and thin discs
• The impact of very massive stars on the chemical evolution of extremely metal-poor galaxies
• On the effects of the Initial Mass Function on Galactic chemical enrichment
• Predicted rates of merging neutron stars in galaxies
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• Chemical Evolution of Ytterbium in the Galactic Disk
• Chemical evolution of ${}^{26}$Al and ${}^{60}$Fe in the Milky Way
• Impact of AGB stars on the chemical evolution of neutron-capture elements
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• Nitrogen evolution in the halo, thick disc, thin disc and bulge of the Galaxy
• Cobalt and copper abundances in 56 Galactic bulge red giants
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• On the Contribution of Very Massive Stars to the Sulfur Abundance in Star-Forming Galaxies: the Role of PISN
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