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The Gaia-ESO Survey...
The Gaia-ESO Survey : Inhibited extra mixing in two giants of the open cluster Trumpler 20?
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- Smiljanic, R. (author)
- Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
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- Franciosini, E. (author)
- INAF - Osservatorio Astrofisico di Arcetri
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- Randich, S. (author)
- INAF - Osservatorio Astrofisico di Arcetri
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- Magrini, L. (author)
- INAF - Osservatorio Astrofisico di Arcetri
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- Bragaglia, A. (author)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
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- Pasquini, L. (author)
- European Southern Observatory
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- Vallenari, A. (author)
- INAF - Osservatorio Astronomico di Padova
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- Tautvaišiene, G. (author)
- Vilnius University
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- Biazzo, K. (author)
- Osservatorio Astrofisico di Catania
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- Frasca, A. (author)
- Osservatorio Astrofisico di Catania
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- Donati, P. (author)
- University of Bologna
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- Delgado Mena, E. (author)
- University of Porto
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- Casey, A. R. (author)
- University of Cambridge
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- Geisler, D. (author)
- University of Concepción
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- Villanova, S. (author)
- University of Concepción
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- Tang, B. (author)
- University of Concepción
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- Sousa, S. G. (author)
- University of Porto
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- Gilmore, G. (author)
- University of Cambridge
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- Bensby, T. (author)
- 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. (author)
- University of Picardie Jules Verne
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- Koposov, S. E. (author)
- University of Cambridge
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- Lanzafame, A. C. (author)
- University of Catania
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- Pancino, E. (author)
- Italian Space Agency
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- Recio-Blanco, A. (author)
- Centre d'Ecologie Fonctionnelle et Evolutive (CEFE)
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- Costado, M. T. (author)
- CSIC Instituto de Astrofísica de Andalucía (IAA)
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- Hourihane, A. (author)
- University of Cambridge
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- Lardo, C. (author)
- Liverpool John Moores University
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- De Laverny, P. (author)
- Centre d'Ecologie Fonctionnelle et Evolutive (CEFE)
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- Lewis, J. (author)
- University of Cambridge
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- Monaco, L. (author)
- Andrés Bello National University
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- Morbidelli, L. (author)
- INAF - Osservatorio Astrofisico di Arcetri
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- Sacco, G. G. (author)
- INAF - Osservatorio Astrofisico di Arcetri
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- Worley, C. C. (author)
- University of Cambridge
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- Zaggia, S. (author)
- INAF - Osservatorio Astronomico di Padova
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- Martell, S. (author)
- University of New South Wales
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(creator_code:org_t)
- 2016-06-13
- 2016
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 591
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http://dx.doi.org/10...
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https://www.aanda.or...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We report the discovery of two Li-rich giants, with A(Li) ~ 1.50, in an analysis of a sample of 40 giants of the open cluster Trumpler 20 (with turnoff mass ~1.8 M⊙). The cluster was observed in the context of the Gaia-ESO Survey. Methods. The atmospheric parameters and Li abundances were derived using high-resolution UVES spectra. The Li abundances were corrected for nonlocal thermodynamical equilibrium (non-LTE) effects. Results. Only upper limits of the Li abundance could be determined for the majority of the sample. Two giants with detected Li turned out to be Li rich: star MG 340 has A(Li)non-LTE = 1.54 ± 0.21 dex and star MG 591 has A(Li)non-LTE = 1.60 ± 0.21 dex. Star MG 340 is on average ~0.30 dex more rich in Li than stars of similar temperature, while for star MG 591 this difference is on average ~0.80 dex. Carbon and nitrogen abundances indicate that all stars in the sample have completed the first dredge-up. Conclusions. The Li abundances in this unique sample of 40 giants in one open cluster clearly show that extra mixing is the norm in this mass range. Giants with Li abundances in agreement with the predictions of standard models are the exception. To explain the two Li-rich giants, we suggest that all events of extra mixing have been inhibited. This includes rotation-induced mixing during the main sequence and the extra mixing at the red giant branch luminosity bump. Such inhibition has been suggested in the literature to occur because of fossil magnetic fields in red giants that are descendants of main-sequence Ap-type stars.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Open clusters and associations: individual: Trumpler 20
- Stars: abundances
- Stars: evolution
- Stars: late-type
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Smiljanic, R.
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Franciosini, E.
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Randich, S.
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Magrini, L.
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Bragaglia, A.
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Pasquini, L.
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Vallenari, A.
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Tautvaišiene, G.
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Biazzo, K.
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Frasca, A.
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Donati, P.
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Delgado Mena, E.
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Casey, A. R.
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Geisler, D.
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Villanova, S.
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Tang, B.
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Sousa, S. G.
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Gilmore, G.
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Bensby, T.
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François, P.
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Koposov, S. E.
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Lanzafame, A. C.
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Pancino, E.
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Recio-Blanco, A.
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Costado, M. T.
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Hourihane, A.
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Lardo, C.
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De Laverny, P.
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Lewis, J.
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Monaco, L.
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Morbidelli, L.
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Sacco, G. G.
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Worley, C. C.
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Zaggia, S.
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Martell, S.
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Lund University