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The Gaia-ESO Survey :
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Sanna, N.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri
(author)
The Gaia-ESO Survey : an extremely Li-rich giant in globular cluster NGC 1261
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2020-07-03
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EDP SCIENCES S A,2020
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:uu-419694
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-419694URI
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https://doi.org/10.1051/0004-6361/202038435DOI
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https://lup.lub.lu.se/record/77543f39-4a69-4f63-beec-37f7ab1113d4URI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Lithium-rich stars in globular clusters are rare. Only 14 have been found so far, in different evolutionary phases from dwarfs to giants. Different mechanisms have been proposed to explain this enhancement, but it is still an open problem. Using spectra collected within the Gaia-ESO Survey, obtained with the GIRAFFE spectrograph at the ESO Very Large Telescope, we present the discovery of the first Li-rich star in the cluster NGC 1261, the second star known in the red giant branch bump phase. The star shows an extreme Li overabundance of A(Li)(LTE)=3.92 +/- 0.14, corresponding to A(Li)(NLTE)=3.40 dex. We propose that the Li enhancement is caused by fresh Li production through an extra mixing process (sometimes referred to as cool bottom burning). Alternatively, it could be a pre-existing Li overabundance caused by mass-transfer from a red giant star; this mechanism does not enhance the barium abundance and thus we observe low barium. To unambiguously explain the Li enhancement in globular cluster stars, however, a reliable determination of the abundance of key species like Be, Li-6, C-12/C-13, and several s-process elements is required, as well as detailed modelling of chromospheric activity indicators.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Franciosini, E.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri
(author)
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Pancino, E.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.;ASI Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy.,INAF - Osservatorio Astrofisico di Arcetri,Italian Space Agency
(author)
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Mucciarelli, A.Univ Bologna, Dipartimento Fis & Astron, Via Gobetti 93-2, I-40129 Bologna, Italy.;INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy.,University of Bologna,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
(author)
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Tsantaki, M.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri
(author)
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Charbonnel, C.Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.;CNRS, UMR 5277, IRAP, 14 Av E Belin, F-31400 Toulouse, France.;Univ Toulouse, 14 Av E Belin, F-31400 Toulouse, France.,University of Geneva,University of Toulouse
(author)
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Smiljanic, R.Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland.,Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences,INAF - Osservatorio Astrofisico di Arcetri
(author)
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Fu, X.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China.,Peking University
(author)
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Bragaglia, A.INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy.,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
(author)
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Lagarde, N.Univ Bourgogne Franche Comte, OSU THETA Franche Comte Bourgogne, Inst UTINAM, Observ Besancon,CNRS,UMR 6213, BP 1615, F-25010 Besancon, France.,University of Burgundy - Franche-Comté,Observatoire de Besancon
(author)
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Tautvaisiene, G.Vilnius Univ, Astron Observ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10257 Vilnius, Lithuania.,Vilnius University
(author)
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Magrini, L.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri
(author)
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Randich, S.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.
(author)
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Bensby, T.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(Swepub:lu)astr-tbe
(author)
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Korn, Andreas J.,1972-Uppsala University,Uppsala universitet,Observationell astrofysik(Swepub:uu)ankor103
(author)
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Bayo, A.Univ Valparaiso, Fac Ciencias, Inst Fis & Astron, Av Gran Bretana 1111,5030 Casilla, Valparaiso, Chile.;Univ Valparaiso, Nucleo Milenio Formac Planetaria NPF, Av Gran Bretana 1111, Valparaiso, Chile.,University of Valparaíso
(author)
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Bergemann, M.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.,Max Planck Institute for Astronomy
(author)
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Carraro, G.Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy.,University of Padova
(author)
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Morbidelli, L.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri
(author)
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INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.INAF - Osservatorio Astrofisico di Arcetri
(creator_code:org_t)
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In:Astronomy and Astrophysics: EDP SCIENCES S A6390004-63611432-0746
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Sanna, N.
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Franciosini, E.
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Pancino, E.
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Mucciarelli, A.
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Tsantaki, M.
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Charbonnel, C.
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Smiljanic, R.
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Fu, X.
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Bragaglia, A.
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Lagarde, N.
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Tautvaisiene, G.
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Magrini, L.
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Randich, S.
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Bensby, T.
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Korn, Andreas J. ...
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Bayo, A.
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Bergemann, M.
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Carraro, G.
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Morbidelli, L.
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