Fluorine in the solar neighborhood: modelling the Galactic thick and thin discs

Abstract

We investigate the evolution of the abundance of fluorine in the Milky Way thick and thin discs by means of detailed chemical evolution models compared with recent observational data. The chemical evolution models adopted here have already been shown to fit the observed abundance patterns of CNO and $\alpha$-elements as well as the metallicity distribution functions for the Galactic thick and thin disc stars. We apply them here to the study of the origin and evolution of fluorine, which is still a matter of debate. First, we study the importance of the various sites proposed for the production of fluorine. Then, we apply the reference models to follow the evolution of the two different Galactic components. We conclude that rotating massive stars are important producers of F and they can set a plateau in F abundance below [Fe/H]=-0.5 dex, though its existence for [Fe/H]<-1 has yet to be confimed by extensive observations of halo stars. In order to reproduce the F abundance increase in the discs at late times, instead, a contribution from lower mass stars - single asymptotic giant branch stars and/or novae - is required. The dichotomy between the thick and thin discs is more evident in the [F/O] vs. [O/H] plot than in the [F/Fe] vs. [Fe/H] one, and we confirm that the thick disc has evolved much faster than the thin disc, in agreement with findings from the abundance patterns of other chemical elements.

8 pages, 2 figures. Accepted for publication in MNRAS

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• The Gaia-ESO Survey: Galactic evolution of lithium from iDR6
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• Zero and extremely low metallicity rotating massive stars: evolution, explosion, and nucleosynthesis up to the heaviest nuclei
• Magnetic-buoyancy-induced mixing in AGB Stars: fluorine nucleosynthesis at different metallicities
• The Pristine survey XIII: Uncovering the very metal-poor tail of the thin disc
• 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
• The ramp-up of interstellar medium enrichment at z>4
• Chemical Evolution of Fluorine in the Milky Way
• Fluorine Abundances in the Galactic Nuclear Star Cluster
• M Giants with IGRINS II. Chemical Evolution of Fluorine at High Metallicities
• Stellar population astrophysics (SPA) with the TNG -- The Arcturus Lab
• Nitrogen evolution in the halo, thick disc, thin disc and bulge of the Galaxy
• Explaining the ${}^{12}\text{C}{/}^{13}\text{C}$ ratio in the Galactic halo: the contribution from shell mergers in primordial massive stars
• First detection of AlF line emission towards M-type AGB stars
• Exploring fluorine chemical evolution in the Galactic disk: the open cluster perspective
• M giants with IGRINS IV. Identification and characterization of a near-IR line of the s-element Barium
• Fluorine Abundances in Local Stellar Populations