[Mg/Fe] ratios in the solar neighbourhood: stellar yields and chemical evolution scenarios

Abstract

Context. The [Mg/Fe] abundance ratios are a fundamental fossil signature to trace the chemical evolution of the disc. Despite of the huge observational and theoretical effort, discrepancies between models and data are still present and several explanations have been put forward to explain the [$\alpha$/Fe] bimodality. Aims. In this work, we take advantage of a new AMBRE:HARPS dataset, which provides new and more precise [Mg/Fe] estimations, as well as reliable stellar ages for a subsample of stars, to study the evolution of the solar neighbourhood. Methods. The above data are compared with detailed chemical evolution models for the Milky Way, exploring the most used prescriptions for stellar yields and different formation scenarios for the Galactic disc, i.e. the delayed two-infall and the parallel model, also including prescriptions for stellar radial migration. Results. We see that most of the stellar yields struggle to reproduce the observed trend of the data and that semi-empirical yields are still the best to describe the [Mg/Fe] evolution in the thick and thin discs. In particular, most of the yields still predict a steeper decrease of the [Mg/Fe] ratio at high metallicity than what is shown by the data. The bulk of the data are well reproduced by the parallel and two-infall scenarios, but both scenarios have problems in explaining the most metal-rich and metal-poor tails of the low-$\alpha$ data. These tails can be explained in light of radial migration from inner and outer disc regions, respectively. Conclusions. Despite of the evidence of stellar migration, it is difficult to estimate the actual contribution of stars from other parts of the disc to the solar vicinity. However, the comparison between data and models suggests that peculiar histories of star formation, such as that of the two-infall model, are still needed to reproduce the observed distribution of stars.

16 pages, 16 figures. Accepted for publication in Astronomy and Astrophysics (A&A)

References in corpus (36)

• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Galactic chemical evolution: Carbon through Zinc
• Improving PARSEC models for very low mass stars
• Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
• New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies
• The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
• The Gaia-ESO Survey: the Galactic Thick to Thin Disc transition
• Constraining the thermally-pulsing asymptotic giant branch phase with resolved stellar populations in the Small Magellanic Cloud
• Tracing chemical evolution over the extent of the Milky Way's Disk with APOGEE Red Clump Stars
• Young [$\alpha$/Fe]-enhanced stars discovered by CoRoT and APOGEE: What is their origin?
• Constraining the thermally pulsing asymptotic giant branch phase with resolved stellar populations in the Large Magellanic Cloud
• Automated derivation of stellar atmospheric parameters and chemical abundances: the MATISSE algorithm
• Origin of chemically distinct discs in the Auriga cosmological simulations
• Abundance gradients in the Milky Way for alpha elements, Iron peak elements, Barium, Lanthanum and Europium
• The Gaia-ESO Survey: the chemical structure of the Galactic discs from the first internal data release
• The AMBRE Project: chemical evolution models for the Milky Way thick and thin discs
• The imprint of clump formation at high redshift. I. A disc alpha-abundance dichotomy
• Binary stars in the Galactic thick disc
• The AMBRE project: The thick thin disk and thin thick disk of the Milky Way
• APOGEE DR16: a multi-zone chemical evolution model for the Galactic disc based on MCMC methods
• Extended distribution functions for our Galaxy
• The Rich Are Different: Evidence from the RAVE Survey for Stellar Radial Migration
• Open clusters in APOGEE and GALAH: Combining Gaia and ground-based spectroscopic surveys
• Stellar migrations and metal flows -- Chemical evolution of the thin disc of a simulated Milky Way analogous galaxy
• Chemical evolution of the Milky Way: constraints on the formation of the thick and thin discs
• A Milky Way with a massive, centrally concentrated thick disc: new Galactic mass models for orbit computations
• The effect of stellar migration on Galactic chemical evolution: a heuristic approach
• The Gaia-ESO Survey: Galactic evolution of lithium from iDR6
• The effects of different Type Ia SN yields on Milky Way chemical evolution
• The Galactic habitable zone around M and FGK stars with chemical evolution models with dust
• The AMBRE Project: Parameterisation of FGK-type stars from the ESO:HARPS archived spectra
• Most "young" $\alpha$-rich stars have high masses but are actually old
• The distribution of [$\alpha$/Fe] in the Milky Way disc
• The AMBRE Project: Spectrum normalisation influence on Mg abundances in the metal-rich Galactic disc
• The AMBRE Project: Solar neighbourhood chemodynamical constraints on Galactic disc evolution
• Galactic archaeology at high redshift: inferring the nature of GRB host galaxies from abundances

Cited by in corpus (1)

• Beyond the two-infall model I. Indications for a recent gas infall with Gaia DR3 chemical abundances