The Gaia-ESO Survey: properties of newly discovered Li-rich giants

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The Gaia-ESO Survey : properties of newly discovered Li-rich giants

Smiljanic, R. (författare): Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland.,Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences,INAF - Osservatorio Astrofisico di Arcetri

Franciosini, E. (författare): INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri

Bragaglia, A. (författare): INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy.,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna

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Tautvaisiene, G. (författare): Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10257 Vilnius, Lithuania.,Vilnius University

Fu, X. (författare): INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy.;Univ Bologna, Dipartimento Fis & Astron, Via Gobetti 93-2, I-40129 Bologna, Italy.,INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna,University of Bologna

Pancino, E. (författare): INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.;Agenzia Spaziale Italiana, Space Sci Data Ctr, Via Politecn Snc, I-00133 Rome, Italy.,INAF - Osservatorio Astrofisico di Arcetri,Italian Space Agency

Adibekyan, V. (författare): Univ Porto, CAUP, Inst Astrofis & Ciencias Espaco, Rua Estrelas, P-4150762 Porto, Portugal.,University of Porto,INAF - Osservatorio Astronomico di Padova

Sousa, S. G. (författare): Univ Porto, CAUP, Inst Astrofis & Ciencias Espaco, Rua Estrelas, P-4150762 Porto, Portugal.,University of Porto,University of Cambridge

Randich, S. (författare): INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.

Montalban, J. (författare): Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.,University of Padova

Pasquini, L. (författare): European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.,European Southern Observatory,Université Nice Sophia Antipolis

Magrini, L. (författare): INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri

Drazdauskas, A. (författare): Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10257 Vilnius, Lithuania.,Vilnius University

Garcia, R. A. (författare): Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.;Univ Paris Diderot, AIM, Sorbonne Paris Cite, CEA,CNRS, F-91191 Gif Sur Yvette, France.,Paris Diderot University,University of Paris-Saclay

Mathur, S. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.;Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA.,Space Science Institute,University of La Laguna (ULL),Instituto de Astrofísica de Canarias

Mosser, B. (författare): Univ Paris Diderot, Sorbonne Paris Cite, LESIA,Observ Paris, Univ PSL,CNRS,Sorbonne Univ, F-92195 Meudon, France.,LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique

Regulo, C. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.,Instituto de Astrofísica de Canarias,University of La Laguna (ULL)

Peralta, R. de Assis (författare): Univ Paris Diderot, Sorbonne Paris Cite, LESIA,Observ Paris, Univ PSL,CNRS,Sorbonne Univ, F-92195 Meudon, France.,LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique

Hekker, S. (författare): Max Planck Inst Solar Syst Res, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.,Aarhus University,Max Planck Institute for Solar System Research

Feuillet, D. (författare): Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.,Max Planck Institute for Astronomy

Valentini, M. (författare): Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany.,Leibniz Institute for Astrophysics Potsdam (AIP)

Morel, T. (författare): Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Allee 6 Aout 19c,Bat B5C, B-4000 Liege, Belgium.,University of Liège,University of Cádiz

Martell, S. (författare): Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia.,University of New South Wales

Gilmore, G. (författare): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.,University of Padova

Feltzing, S. (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

Vallenari, A. (författare): INAF Padova Observ, Vicolo Osservatorio 5, Padua, Italy.

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

Korn, Andreas J., 1972- (författare): Uppsala University,Uppsala universitet,Observationell astrofysik

Lanzafame, A. C. (författare): Univ Catania, Sez Astrofis, Dipartimento Fis & Astron, Via S Sofia 78, I-95123 Catania, Italy.,University of Catania

Recio-Blanco, A. (författare): Univ Nice Sophia Antipolis, CNRS, Observ Cote Azur, Lab Lagrange,UMR7293, CS 34229, F-06304 Nice 4, France.,Université Nice Sophia Antipolis

Bayo, A. (författare): Univ Valparaiso, Inst Fis & Astron, Valparaiso, Chile.;Univ Valparaiso, Nucleo Milenio Formac Planetaria NPF, Av Gran Bretana 1111, Valparaiso, Chile.,University of Valparaíso

Carraro, G. (författare): Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.

Costado, M. T. (författare): Univ Cadiz, Dept Didact, Cadiz 11519, Spain.,Instituto de Astrofísica de Canarias,University of La Laguna (ULL)

Frasca, A. (författare): INAF Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy.,Osservatorio Astrofisico di Catania

Jofre, P. (författare): Univ Diego Portales, Fac Ingn, Nucleo Astron, Santiago, Chile.,Diego Portales University

Lardo, C. (författare): EPFL, Lab Astrophys, Observ Sauverny, CH-1290 Versoix, Switzerland.,Swiss Federal Institute of Technology

de laverny, P. (författare): Univ Nice Sophia Antipolis, CNRS, Observ Cote Azur, Lab Lagrange,UMR7293, CS 34229, F-06304 Nice 4, France.,INAF Palermo Astronomical Observatory

Lind, Karin (författare): Uppsala University,Uppsala universitet,Teoretisk astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany,Max Planck Institute for Astronomy

Masseron, T. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.

Monaco, L. (författare): Univ Andres Bello, Dept Ciencias Fis, Fernandez Concha 700, Santiago, Chile.,Andrés Bello National University

Morbidelli, L. (författare): INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri

Prisinzano, L. (författare): INAF Osservatorio Astron Palermo, Piazza Parlamento 1, I-90134 Palermo, Italy.

Sbordone, L. (författare): European Southern Observ, Alonso Cordova 3107 Vitacura, Santiago, Chile.,European Southern Observatory Santiago

Zaggia, S. (författare): INAF Padova Observ, Vicolo Osservatorio 5, Padua, Italy.,INAF - Osservatorio Astronomico di Padova

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Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences (creator_code:org_t)

2018-09-14
2018
Engelska.
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 617

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Tidskriftsartikel (refereegranskat)

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Aims. We report 20 new lithium-rich giants discovered within the Gaia-ESO Survey, including the first Li-rich giant with an evolutionary stage confirmed by CoRoT (Convection, Rotation and planetary Transits) data. We present a detailed overview of the properties of these 20 stars. Methods. Atmospheric parameters and abundances were derived in model atmosphere analyses using medium-resolution GIRAFFE or high-resolution UVES (Ultraviolet and Visual Echelle Spectrograph) spectra. These results are part of the fifth internal data release of the Gaia-ESO Survey. The Li abundances were corrected for non-local thermodynamical equilibrium effects. Other stellar properties were investigated for additional peculiarities (the core of strong lines for signs of magnetic activity, infrared magnitudes, rotational velocities, chemical abundances, and Galactic velocities). We used Gaia DR2 parallaxes to estimate distances and luminosities. Results. The giants have A(Li) > 2.2 dex. The majority of them (14 of 20 stars) are in the CoRoT fields. Four giants are located in the field of three open clusters, but are not members. Two giants were observed in fields towards the Galactic bulge, but likely lie in the inner disc. One of the bulge field giants is super Li-rich with A(Li) = 4.0 dex. Conclusions. We identified one giant with infrared excess at 22 mu m. Two other giants, with large v sin i, might be Li-rich because of planet engulfment. Another giant is found to be barium enhanced and thus could have accreted material from a former asymptotic giant branch companion. Otherwise, in addition to the Li enrichment, the evolutionary stages are the only other connection between these new Li-rich giants. The CoRoT data confirm that one Li-rich giant is at the core-He burning stage. The other giants are concentrated in close proximity to the red giant branch luminosity bump, the core-He burning stages, or the early-asymptotic giant branch. This is very clear from the Gaia-based luminosities of the Li-rich giants. This is also seen when the CoRoT Li-rich giants are compared to a larger sample of 2252 giants observed in the CoRoT fields by the Gaia-ESO Survey, which are distributed throughout the red giant branch in the T-eff-log g diagram. These observations show that the evolutionary stage is a major factor for the Li enrichment in giants. Other processes, such as planet accretion, contribute at a smaller scale.

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The Gaia-ESO Survey : properties of newly discovered Li-rich giants

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