Explaining the decrease in ISM lithium at super-solar metallicities in the solar vicinity

Abstract

We propose here that the lithium decrease at super-solar metallicities observed in high resolution spectroscopic surveys can be explained by the interplay of mixed populations, coming from the inner regions of the Milky Way disc. The lower lithium content of these stars is a consequence of inside-out disc formation, plus radial migration. In this framework, local stars with super-solar metallicities would have migrated to the solar vicinity and depleted their original lithium during their travel time. To arrive to such a result, we took advantage of the AMBRE catalog of lithium abundances combined with chemical evolution models which take into account the contribution to the lithium enrichment by different nucleosynthetic sources. A large proportion of migrated stars can explain the observed lower lithium abundance at super-solar metallicities. We stress that nowadays, there is no stellar model able to predict Li-depletion for such super-solar metallicity stars, and the Solar Li-depletion has to be assumed. In addition, it currently exists no solid quantitative estimate of the proportion of migrated stars in the Solar neighborhood and their travel time. Our results illustrate how important it is to properly include radial migration when comparing chemical evolution models to observations, and that in this case, the lithium decrease at larger metallicities does not necessarily imply that stellar yields have to be modified, contrary to previous claims in literature.

A&A 623, A99 (2019). 5 pages, 2 figures

References in corpus (38)

• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• Chemical evolution with radial mixing
• Abundance Gradients and the Formation of the Milky Way
• Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
• Chemodynamical evolution of the Milky Way disk I: The solar vicinity
• Stellar yields from metal-rich asymptotic giant branch models
• Inside Out and Upside Down: Tracing the Assembly of a Simulated Disk Galaxy Using Mono-Age Stellar Populations
• Thermohaline instability and rotation-induced mixing. III - Grid of stellar models and asymptotic asteroseismic quantities from the pre-main sequence up to the AGB for low- and intermediate-mass stars at various metallicities
• Chemodynamical evolution of the Milky Way disk II: Variations with Galactic radius and height above the disk plane
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program II: Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd and Eu
• Estimating stellar birth radii and the time evolution of the Milky Way's ISM metallicity gradient
• On the Formation of Galactic Thick Disks
• A new alpha-enhanced super-solar metallicity population
• Evolution of the Milky Way with radial motions of stars and gas I. The solar neighborhood and the thin and thick disk
• Production and evolution of Li, Be and B isotopes in the Galaxy
• Red giants observed by CoRoT and APOGEE: The evolution of the Milky Way's radial metallicity gradient
• Li abundances in F stars: planets, rotation and galactic evolution
• The AMBRE project: A new synthetic grid of high-resolution FGKM stellar spectra
• Lithium Abundances of the Local Thin Disk Stars
• The effect of radial migration on galactic disks
• Galactic Archaeology with asteroseismology and spectroscopy: Red giants observed by CoRoT and APOGEE
• A radial age gradient in the geometrically thick disk of the Milky Way
• A new stellar chemo-kinematic relation reveals the merger history of the Milky Way disc
• Dissecting stellar chemical abundance space with t-SNE
• Early optical spectra of nova V1369 Cen show presence of Lithium
• The stellar origin of 7Li - Do AGB stars contribute a substantial fraction of the local Galactic lithium abundance?
• The AMBRE Project: Stellar parameterisation of the ESO:FEROS archived spectra
• Analysis of old very metal rich stars in the solar neighbourhood
• The AMBRE Project: Constraining the lithium evolution in the Milky Way
• Exploring the production and depletion of lithium in the Milky Way stellar disk
• The Gaia -ESO Survey: Lithium enrichment histories of the Galactic thick and thin disc
• The AMBRE Project: Parameterisation of FGK-type stars from the ESO:HARPS archived spectra
• The AMBRE project: a study of Li evolution in the Galactic thin and thick discs
• The AMBRE Project: r-process elements in the Milky Way thin and thick discs
• The AMBRE Project: Stellar Parameterisation of the ESO:UVES archived spectra
• Milky Way's Thick and Thin disk: Is there distinct thick disk?
• Dynamics and Morphology of the Milky Way Spiral Arms from the Metallicity Distribution and Radial Mixing
• Correlations between age, kinematics, and chemistry as seen by the RAVE survey

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