Reference : The Gaia-ESO Survey: CNO abundances in the open clusters Trumpler 20, NGC 4815, and N...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/175798
The Gaia-ESO Survey: CNO abundances in the open clusters Trumpler 20, NGC 4815, and NGC 6705
English
Tautvaišienė, G. [Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, 01108, Vilnius, Lithuania]
Drazdauskas, A. [Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, 01108, Vilnius, Lithuania]
Mikolaitis, Š. [Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, 01108, Vilnius, Lithuania; Laboratoire Lagrange (UMR7293), Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, CS 34229, 06304, Nice Cedex 4, France]
Barisevičius, G. [Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, 01108, Vilnius, Lithuania]
Puzeras, E. [Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, 01108, Vilnius, Lithuania]
Stonkut*error*ė, E. [Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, 01108, Vilnius, Lithuania]
Chorniy, Y. [Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, 01108, Vilnius, Lithuania]
Magrini, L. [INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi, 5, 50125, Florence, Italy]
Romano, D. [INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy]
Smiljanic, R. [Department for Astrophysics, Nicolaus Copernicus Astronomical Center, ul. Rabiańska 8, 87-100, Toruń, Poland]
Bragaglia, A. [INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy]
Carraro, G. [ESO, Alonso de Cordova 3107, 19001, Santiago de Chile, Chile]
Friel, E. [Department of Astronomy, Indiana University, Bloomington, IN, 47405, USA]
Morel, Thierry mailto [Université de Liège - ULiège > > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Pancino, E. [INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy; ASI Science Data Center, via del Politecnico SNC, 00133, Roma, Italy]
Donati, P. [INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy]
Jiménez-Esteban, F. [Spanish Virtual Observatory, Centro de Astrobiología (INTA-CSIC), PO Box 78, 28691, Villanueva de la Caada, Madrid, Spain]
Gilmore, G. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK]
Randich, S. [INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi, 5, 50125, Florence, Italy]
Jeffries, R. D. [Astrophysics Group, Research Institute for the Environment, Physical Sciences and Applied Mathematics, Keele University, Keele, Staffordshire, ST5 5BG, UK]
Vallenari, A. [INAF-Padova Observatory, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Bensby, T. [Lund Observatory, Department of Astronomy and Theoretical Physics, Box 43, 221 00, Lund, Sweden]
Flaccomio, E. [INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134, Palermo, Italy]
Recio-Blanco, A. [Laboratoire Lagrange (UMR7293), Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, CS 34229, 06304, Nice Cedex 4, France]
Costado, M. T. [Instituto de Astrofísica de Andalucía-CSIC, Apdo. 3004, 18080, Granada, Spain]
Hill, V. [Laboratoire Lagrange (UMR7293), Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, CS 34229, 06304, Nice Cedex 4, France]
Jofré, P. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK]
Lardo, C. [Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool, L3 5RF, UK]
de Laverny, P. [Laboratoire Lagrange (UMR7293), Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, CS 34229, 06304, Nice Cedex 4, France]
Masseron, T. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK]
Moribelli, L. [INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi, 5, 50125, Florence, Italy]
Sousa, S. G. [Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal]
Zaggia, S. [INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127, Bologna, Italy)]
1-Jan-2015
Astronomy and Astrophysics
573
55
Yes
International
[en] stars: abundances ; stars: evolution ; Galaxy: evolution ; open clusters and associations: individual: Trumpler 20 ; open clusters and associations: individual: NGC 4815 ; open clusters and associations: individual: NGC 6705
[en] Context. The Gaia-ESO Public Spectroscopic Survey will observe a large sample of clusters and cluster stars, covering a wide age-distance-metallicity-position-density parameter space. <BR /> Aims: We aim to determine C, N, and O abundances in stars of Galactic open clusters of the Gaia-ESO survey and to compare the observed abundances with those predicted by current stellar and Galactic evolution models. In this pilot paper, we investigate the first three intermediate-age open clusters. <BR /> Methods: High-resolution spectra, observed with the FLAMES-UVES spectrograph on the ESO VLT, were analysed using a differential model atmosphere method. Abundances of carbon were derived using the C[SUB]2[/SUB] band heads at 5135 and 5635.5 Å. The wavelength interval 6470-6490 Å, with CN features, was analysed to determine nitrogen abundances. Oxygen abundances were determined from the [O i] line at 6300 Å. <BR /> Results: The mean values of the elemental abundances in Trumpler 20 as determined from 42 stars are: [ Fe/H ] = 0.10 ± 0.08 (s.d.), [ C/H ] = -0.10 ± 0.07, [ N/H ] = 0.50 ± 0.07, and consequently C/N = 0.98 ± 0.12. We measure from five giants in NGC 4815: [ Fe/H ] = -0.01 ± 0.04, [ C/H ] = -0.17 ± 0.08, [ N/H ] = 0.53 ± 0.07, [ O/H ] = 0.12 ± 0.09, and C/N = 0.79 ± 0.08. We obtain from 27 giants in NGC 6705: [ Fe/H ] = 0.0 ± 0.05, [ C/H ] = -0.08 ± 0.06, [ N/H ] = 0.61 ± 0.07, [ O/H ] = 0.13 ± 0.05, and C/N = 0.83 ± 0.19. The C/N ratios of stars in the investigated open clusters were compared with the ratios predicted by stellar evolutionary models. For the corresponding stellar turn-off masses from 1.9 to 3.3 M[SUB]⊙[/SUB], the observed C/N ratio values are very close to the predictions of standard first dredge-up models as well as to models of thermohaline extra-mixing. They are not decreased as much as predicted by the recent model in which the thermohaline- and rotation-induced extra-mixing act together. The average [O/H] abundance ratios of NGC 4815 and NGC 6705 are compared with the predictions of two Galactic chemical evolution models. The data are consistent with the evolution at the solar radius within the errors. <BR /> Conclusions: The first results of CNO determinations in open clusters show the potential of the Gaia-ESO Survey to judge stellar and Galactic chemical evolution models and the validity of their physical assumptions through a homogeneous and detailed spectral analysis. Based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under programme ID 188.B-3002 (The Gaia-ESO Public Spectroscopic Survey, PIs G. Gilmore and S. Randich).
http://hdl.handle.net/2268/175798
10.1051/0004-6361/201424989
http://adsabs.harvard.edu/abs/2015A%26A...573A..55T

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
AA_573_A55.pdfPublisher postprint4.01 MBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.