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Gaia -ESO survey : ...
Gaia -ESO survey : Lithium abundances in open cluster Red Clump stars
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- Magrini, L. (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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- Franciosini, E. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Pasquini, L. (författare)
- European Southern Observatory
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- Randich, S. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Casali, G. (författare)
- University of Bologna,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Viscasillas Vázquez, C. (författare)
- Vilnius University
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- Bragaglia, A. (författare)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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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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- Tautvaišienė, G. (författare)
- Vilnius University
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- Masseron, T. (författare)
- Instituto de Astrofísica de Canarias,University of La Laguna (ULL)
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- Van Der Swaelmen, M. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Pancino, E. (författare)
- INAF - Osservatorio Astrofisico di Arcetri,Italian Space Agency
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- Jiménez-Esteban, F. (författare)
- CSIC Centro de Astrobiologia (INTA)
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- Guiglion, G. (författare)
- Leibniz Institute for Astrophysics Potsdam (AIP)
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- Martell, S. (författare)
- University of New South Wales
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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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- D'orazi, V. (författare)
- INAF - Osservatorio Astronomico di Padova
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- Baratella, M. (författare)
- INAF - Osservatorio Astronomico di Padova,University of Padova
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- Korn, A. (författare)
- Lund University
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- Jofre, P. (författare)
- Diego Portales University
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- Gilmore, G. (författare)
- University of Cambridge
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- Worley, C. (författare)
- University of Cambridge
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- Hourihane, A. (författare)
- University of Cambridge
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- Gonneau, A. (författare)
- University of Cambridge
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- Sacco, G. G. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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- Morbidelli, L. (författare)
- INAF - Osservatorio Astrofisico di Arcetri
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(creator_code:org_t)
- 2021-11-05
- 2021
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 655
- Relaterad länk:
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http://dx.doi.org/10...
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http://arxiv.org/pdf...
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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
- Context. It has recently been suggested that all giant stars with masses below 2 M? suffer an episode of surface lithium enrichment between the tip of the red giant branch (RGB) and the red clump (RC). Aims. We test if the above result can be confirmed in a sample of RC and RGB stars that are members of open clusters. Methods. We discuss Li abundances in six open clusters with ages between 1.5 and 4.9 Gyr (turn-off masses between 1.1 and 1.7 M? ). We compare these observations with the predictions of different models that include rotation-induced mixing, thermohaline instability, mixing induced by the first He flash, and energy losses by neutrino magnetic moment. Results. In six clusters, we find close to 35% of RC stars have Li abundances that are similar or higher than those of upper RGB stars. This can be a sign of fresh Li production. Because of the extra-mixing episode connected to the luminosity bump, the expectation has been for RC stars to have systematically lower surface Li abundances. However, we cannot confirm that this possible Li production is ubiquitous. For about 65% of RC giants, we can only determine upper limits in abundances that could be hiding very low Li content. Conclusions. Our results indicate the possibility that Li is being produced in the RC, at levels that would not typically permit the classification of these the stars as Li rich. The determination of their carbon isotopic ratio would help to confirm that the RC giants have suffered extra mixing followed by subsequent Li enrichment. The Li abundances of the RC stars can be qualitatively explained by the models including an additional mixing episode close to the He flash.
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
- Stars: low-mass
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Magrini, L.
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Smiljanic, R.
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Franciosini, E.
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Pasquini, L.
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Randich, S.
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Casali, G.
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visa fler...
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Viscasillas Vázq ...
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Bragaglia, A.
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Spina, L.
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Biazzo, K.
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Tautvaišienė, G.
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Masseron, T.
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Van Der Swaelmen ...
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Pancino, E.
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Jiménez-Esteban, ...
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Guiglion, G.
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Martell, S.
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Bensby, T.
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D'orazi, V.
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Baratella, M.
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Korn, A.
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Jofre, P.
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Gilmore, G.
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Worley, C.
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Hourihane, A.
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Gonneau, A.
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Sacco, G. G.
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Morbidelli, L.
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- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Astronomi astrof ...
- Artiklar i publikationen
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Astronomy and As ...
- Av lärosätet
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Lunds universitet