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The Gaia -ESO surve...
The Gaia -ESO survey: Mixing processes in low-mass stars traced by lithium abundance in cluster and field stars
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- Magrini, L. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Lagarde, N. (författare)
- University of Burgundy - Franche-Comté
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- Charbonnel, C. (författare)
- University of Toulouse,University of Geneva
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- Franciosini, E. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Randich, S. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Smiljanic, R. (författare)
- Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
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- Casali, G. (författare)
- INAF - Osservatorio Astrofisico di Arcetri,University of Florence
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- Viscasillas Vázquez, C. (författare)
- Vilnius University
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- Spina, L. (författare)
- INAF - Osservatorio Astronomico di Padova
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- Biazzo, K. (författare)
- INAF-Osservatorio Astronomico di Roma
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- Pasquini, L. (författare)
- European Southern Observatory
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- Bragaglia, A. (författare)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Van Der Swaelmen, M. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Tautvaišienė, G. (författare)
- Vilnius University
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- Inno, L. (författare)
- Parthenope University of Naples,INAF Osservatorio Astronomico di Capodimonte
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- Sanna, N. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Prisinzano, L. (författare)
- INAF-Osservatorio Astronomico di Roma
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- Degl'Innocenti, S. (författare)
- University of Pisa,INFN Section of Pisa
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- Prada Moroni, P. (författare)
- INFN Section of Pisa,University of Pisa
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- Roccatagliata, V. (författare)
- INFN Section of Pisa,INAF - Osservatorio Astrofisico di Arcetri,University of Pisa
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- Tognelli, E. (författare)
- INFN Section of Pisa,University of Pisa
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- Monaco, L. (författare)
- Andrés Bello National University
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- De Laverny, P. (författare)
- Côte d'Azur Observatory
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- Delgado-Mena, E. (författare)
- University of Porto
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- Baratella, M. (författare)
- INAF - Osservatorio Astronomico di Padova,University of Padova
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- D'Orazi, V. (författare)
- INAF - Osservatorio Astronomico di Padova
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- Vallenari, A. (författare)
- INAF - Osservatorio Astronomico di Padova
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- Gonneau, A. (författare)
- University of Cambridge
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- Worley, C. (författare)
- University of Cambridge
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- Jiménez-Esteban, F. (författare)
- CSIC Centro de Astrobiologia (INTA)
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- Jofre, P. (författare)
- Diego Portales University
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- Bensby, T. (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- François, P. (författare)
- Paris Observatory
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- Guiglion, G. (författare)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Bayo, A. (författare)
- University of Valparaíso
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- Jeffries, R. D. (författare)
- Keele University
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- Binks, A. S. (författare)
- Keele University
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- Gilmore, G. (författare)
- University of Cambridge
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- Damiani, F. (författare)
- INAF-Osservatorio Astronomico di Roma
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- Korn, A. (författare)
- Lund University
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- Pancino, E. (författare)
- Italian Space Agency,INAF - Osservatorio Astrofisico di Arcetri
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- Sacco, G. G. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Hourihane, A. (författare)
- University of Cambridge
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- Morbidelli, L. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Zaggia, S. (författare)
- INAF - Osservatorio Astronomico di Padova
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(creator_code:org_t)
- 2021-05-21
- 2021
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 651
- Relaterad länk:
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http://dx.doi.org/10...
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https://eprints.keel...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Aims. We aim to constrain the mixing processes in low-mass stars by investigating the behaviour of the Li surface abundance after the main sequence. We take advantage of the data from the sixth internal data release of Gaia-ESO, IDR6, and from the Gaia Early Data Release 3, EDR3s. Methods. We selected a sample of main-sequence, sub-giant, and giant stars in which the Li abundance is measured by the Gaia-ESO survey. These stars belong to 57 open clusters with ages from 130 Myr to about 7 Gyr and to Milky Way fields, covering a range in [Fe/H] between -1.0and +0.5 dex, with few stars between -1.0 and -2.5dex. We studied the behaviour of the Li abundances as a function of stellar parameters. We inferred the masses of giant stars in clusters from the main-sequence turn-off masses, and for field stars through comparison with stellar evolution models using a maximum likelihood technique. We compared the observed Li behaviour in field giant stars and in giant stars belonging to individual clusters with the predictions of a set of classical models and of models with mixing induced by rotation and thermohaline instability. Results. The comparison with stellar evolution models confirms that classical models cannot reproduce the observed lithium abundances in the metallicity and mass regimes covered by the data. The models that include the effects of both rotation-induced mixing and thermohaline instability account for the Li abundance trends observed in our sample in all metallicity and mass ranges. The differences between the results of the classical models and of the rotation models largely differ (up to 2 dex), making lithium the best element with which to constrain stellar mixing processes in low-mass stars. We discuss the nature of a sample of Li-rich stars. Conclusions. We demonstrate that the evolution of the surface abundance of Li in giant stars is a powerful tool for constraining theoretical stellar evolution models, allowing us to distinguish the effect of different mixing processes. For stars with well-determined masses, we find a better agreement of observed surface abundances and models with rotation-induced and thermohaline mixing. Rotation effects dominate during the main sequence and the first phases of the post-main-sequence evolution, and the thermohaline induced mixing after the bump in the luminosity function.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Open clusters and associations: general
- Stars: abundances
- Stars: evolution
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- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Magrini, L.
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Lagarde, N.
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Charbonnel, C.
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Franciosini, E.
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Randich, S.
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Smiljanic, R.
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visa fler...
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Casali, G.
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Viscasillas Vázq ...
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Spina, L.
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Biazzo, K.
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Pasquini, L.
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Bragaglia, A.
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Van Der Swaelmen ...
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Tautvaišienė, G.
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Inno, L.
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Sanna, N.
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Prisinzano, L.
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Degl'Innocenti, ...
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Prada Moroni, P.
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Roccatagliata, V ...
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Tognelli, E.
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Monaco, L.
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De Laverny, P.
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Delgado-Mena, E.
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Baratella, M.
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D'Orazi, V.
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Vallenari, A.
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Gonneau, A.
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Worley, C.
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Jiménez-Esteban, ...
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Jofre, P.
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Bensby, T.
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François, P.
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Guiglion, G.
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Bayo, A.
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Jeffries, R. D.
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Binks, A. S.
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Gilmore, G.
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Damiani, F.
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Korn, A.
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Pancino, E.
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Sacco, G. G.
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Hourihane, A.
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Morbidelli, L.
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Zaggia, S.
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- NATURVETENSKAP
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Lunds universitet