WFRF:(Albarran M. L. Gutierrez)
Sökning: WFRF:(Albarran M. L. Gutierrez) > (2021) > The Gaia-ESO Survey :
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The Gaia-ESO Survey : Galactic evolution of lithium from iDR6
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- Romano, D. (författare)
- INAF, Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna,Keele University,Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England
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- Magrini, L. (författare)
- INAF, Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy,INAF - Osservatorio Astrofisico di Arcetri,Complutense University of Madrid,Univ Complutense Madrid, Fac Ciencias Fis, Dept Fis Tierra & Astrofis, Madrid 28040, Spain.;Univ Complutense Madrid, Fac Ciencias Fis, Inst Fis Particulas & Cosmos UCM, IPARCO SUCM, Madrid 28040, Spain
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- Randich, S. (författare)
- INAF, Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy,INAF - Osservatorio Astrofisico di Arcetri,Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences,Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland
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- 2021-09-09
- 2021
- Engelska.
- Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 653
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Context. After more than 50 years, astronomical research still struggles to reconstruct the history of lithium enrichment in the Galaxy and to establish the relative importance of the various 7Li sources in enriching the interstellar medium (ISM) with this fragile element.Aims. To better trace the evolution of lithium in the Milky Way discs, we exploit the unique characteristics of a sample of open clusters (OCs) and field stars for which high-precision 7Li abundances and stellar parameters are homogeneously derived by the Gaia-ESO Survey (GES).Methods. We derive possibly un-depleted 7Li abundances for 26 OCs and star forming regions with ages from young (∼3 Myr) to old (∼4.5 Gyr), spanning a large range of galactocentric distances, 5 < RGC/kpc < 15, which allows us to reconstruct the local late Galactic evolution of lithium as well as its current abundance gradient along the disc. Field stars are added to look further back in time and to constrain 7Li evolution in other Galactic components. The data are then compared to theoretical tracks from chemical evolution models that implement different 7Li forges.Results. Thanks to the homogeneity of the GES analysis, we can combine the maximum average 7Li abundances derived for the clusters with 7Li measurements in field stars. We find that the upper envelope of the 7Li abundances measured in field stars of nearly solar metallicities (−0.3 < [Fe/H]/dex < +0.3) traces very well the level of lithium enrichment attained by the ISM as inferred from observations of cluster stars in the same metallicity range. We confirm previous findings that the abundance of 7Li in the solar neighbourhood does not decrease at super-solar metallicity. The comparison of the data with the chemical evolution model predictions favours a scenario in which the majority of the 7Li abundance in meteorites comes from novae. Current data also seem to suggest that the nova rate flattens out at later times. This requirement might have implications for the masses of the white dwarf nova progenitors and deserves further investigation. Neutrino-induced reactions taking place in core-collapse supernovae also produce some fresh lithium. This likely makes a negligible contribution to the meteoritic abundance, but could be responsible for a mild increase in the 7Li abundance in the ISM of low-metallicity systems that would counterbalance the astration processes.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Galaxy: abundances
- Galaxy: evolution
- Galaxy: stellar content
- stars: abundances
- open clusters and associations: general
- nuclear reactions
- nucleosynthesis
- abundances
- Galaxy: abundances
- Galaxy: evolution
- Galaxy: stellar content
- Nuclear reactions, nucleosynthesis, abundances
- Open clusters and associations: general
- Stars: abundances
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- Romano, D.
- Magrini, L.
- Randich, S.
- Casali, G.
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- Matteucci, F.
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