Lithium evolution in the Galactic thin disc from Main-Sequence and early Red-Giant-Branch stars

Abstract

The role of novae as producers of galactic lithium has been suggested since the 1970s, and it has been reconsidered recently with the detection of ${}^7$Be in their outbursts. At the same time, stellar models are moving forward to comprehend the discrepancy between the primordial lithium abundance predicted by the standard Big Bang Nucleosynthesis theory and the measured value of old dwarf stars. In this work, we follow the evolution of ${}^7$Li in the galactic thin disc starting from a primordial value of A(Li)=2.69 dex and applying ${}^7$Li depletion corrections of the stellar model with overshooting to our chemical evolution models. We use the upper envelope of the observational data to constrain the models. In addition to the dwarf main sequence (MS) stars, our analysis includes, for the first time, the early red-giant-branch (RGB) stars. Besides the renowned Spite plateau of the MS stars at low metallicities, we also confirm the existence of a second A(Li) plateau of the early RGB stars, which can be explained by our model with the corrections from stellar models. Our best-fit model is obtained with an effective averaged ${}^7$Li yield ${}^{Li}{Y}_{\mathrm{Nova}}=2.34\times 10^{-5}{M}_{\odot }$ during the whole lifetime of a nova. This reinforces the possibility that novae are the main galactic ${}^7$Li source, together with the stellar models' ability to comprehend the "cosmological lithium problem" in this context.

9 pages, 10 figures, accepted for publication in A&A journal

References in corpus (53)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Planck 2013 results. XVI. Cosmological parameters
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Big Bang Nucleosynthesis: 2015
• The GALAH Survey: Scientific Motivation
• The GALAH+ Survey: Third Data Release
• Stellar evolution with rotation VIII: Models at Z = 10^{-5} and CNO yields for early galactic evolution
• Updated Big Bang Nucleosynthesis confronted to WMAP observations and to the Abundance of Light Elements
• Thermohaline mixing: A physical mechanism governing the photospheric composition of low-mass giants
• Primordial Nucleosynthesis in Light of WMAP
• Implications of WMAP observations on Li abundance and stellar evolution models
• Signatures of intrinsic Li depletion and Li-Na anti-correlation in the metal-poor globular cluster NGC6397
• Atomic Diffusion and Mixing in Old Stars I. VLT/FLAMES-UVES Observations of Stars in NGC 6397
• PARSEC V2.0: Stellar tracks and isochrones of low and intermediate mass stars with rotation
• Production and evolution of Li, Be and B isotopes in the Galaxy
• Standard big bang nucleosynthesis and primordial CNO Abundances after Planck
• Explosive lithium production in the classical nova V339 Del (Nova Delphini 2013)
• The Lithium Content of the Galactic Halo Stars
• A new tension in the cosmological model from primordial deuterium?
• Early optical spectra of nova V1369 Cen show presence of Lithium
• Galactic chemical evolution of Lithium: interplay between stellar sources"
• Impact of rotation and disc lifetime on pre-main sequence lithium depletion of solar-type stars
• Observations of Galactic and Extragalactic Novae
• The stellar origin of 7Li - Do AGB stars contribute a substantial fraction of the local Galactic lithium abundance?
• Highly Enriched 7Be in the ejecta of Nova Sagittarii 2015 No. 2 (V5668 Sgr) and the Galactic Lithium origin
• Lithium-rich Giants in LAMOST Survey. I. The Catalog
• The lithium content of omega Centauri. New clues to the cosmological Li problem from old stars in external galaxies
• Exploring the production and depletion of lithium in the Milky Way stellar disk
• The ${}^7$Be II Resonance Lines in Two Classical Novae V5668 Sgr and V2944 Oph
• The Gaia-ESO Survey: Galactic evolution of lithium from iDR6
• The Gaia-ESO survey: Mixing processes in low-mass stars traced by lithium abundance in cluster and field stars
• ${}^7$Li evolution in the thin and thick disks of the Milky Way
• The Gaia -ESO Survey: Lithium enrichment histories of the Galactic thick and thin disc
• On the lithium content of the globular cluster M92
• The GALAH Survey: A new constraint on cosmological lithium and Galactic lithium evolution from warm dwarf stars
• Thermonuclear reaction rates and primordial nucleosynthesis
• Lithium and Beryllium in the Gaia-Enceladus Galaxy
• The Gaia-ESO Survey: Galactic evolution of lithium at high metallicity
• Beryllium detection in the very fast nova ASASSN-16kt (V407 Lupi)
• Discovery of a thin lithium plateau among metal-poor red giant branch stars
• Search for 7Be in the outburst of four recent novae
• The cosmological Lithium problem outside the Galaxy: the Sagittarius globular cluster M54
• The Gaia-ESO Survey: Lithium measurements and new curves of growth
• The evolution of Lithium: implications of a universal Spite plateau
• 7Be detection in the 2021 outburst of RS Oph
• Detection of ${}^7$Be II in the Classical Nova V5669 Sgr (Nova Sagittarii 2015 No.3)
• PARSEC V2.0: Rotating tracks and isochrones for seven addtional metallicities in the range Z=0.0001-0.03
• Extragalactic 85Rb/87Rb and 6Li/7Li ratios in the Small Magellanic Cloud
• Novae: An Important Source of Lithium in the Galaxy
• Evolution of lithium in the disc of the Galaxy and the role of novae
• A combined study of thermohaline mixing and envelope overshooting with PARSEC: Calibration to NGC 6397 and M4
• Probing the origins. II. Unravelling lithium depletion and stellar motion: Intrinsic stellar properties drive depletion, not kinematics
• Possible evidence for the 478 keV emission line from ${}^7$Be decay during the outburst phases of V1369 Cen

Cited by in corpus (1)

• Gaia-Sausage-Enceladus: Lithium evolution from early red-giant-branch and main-sequence stars