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The Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars

Smiljanic, R.; Korn, A. J.; Bergemann, M.; Frasca, A.; Magrini, L.; Masseron, T.; Pancino, E.; Ruchti, Gregory LU ; San Roman, I. and Sbordone, L., et al. (2014) In Astronomy & Astrophysics 570.
Abstract
Context. The ongoing Gaia-ESO Public Spectroscopic Survey is using FLAMES at the VLT to obtain high-quality medium-resolution Giraffe spectra for about 10(5) stars and high-resolution UVES spectra for about 5000 stars. With UVES, the Survey has already observed 1447 FGK-type stars. Aims. These UVES spectra are analyzed in parallel by several state-of-the-art methodologies. Our aim is to present how these analyses were implemented, to discuss their results, and to describe how a final recommended parameter scale is defined. We also discuss the precision (method-to-method dispersion) and accuracy (biases with respect to the reference values) of the final parameters. These results are part of the Gaia-ESO second internal release and will be... (More)
Context. The ongoing Gaia-ESO Public Spectroscopic Survey is using FLAMES at the VLT to obtain high-quality medium-resolution Giraffe spectra for about 10(5) stars and high-resolution UVES spectra for about 5000 stars. With UVES, the Survey has already observed 1447 FGK-type stars. Aims. These UVES spectra are analyzed in parallel by several state-of-the-art methodologies. Our aim is to present how these analyses were implemented, to discuss their results, and to describe how a final recommended parameter scale is defined. We also discuss the precision (method-to-method dispersion) and accuracy (biases with respect to the reference values) of the final parameters. These results are part of the Gaia-ESO second internal release and will be part of its first public release of advanced data products. Methods. The final parameter scale is tied to the scale defined by the Gaia benchmark stars, a set of stars with fundamental atmospheric parameters. In addition, a set of open and globular clusters is used to evaluate the physical soundness of the results. Each of the implemented methodologies is judged against the benchmark stars to define weights in three different regions of the parameter space. The final recommended results are the weighted medians of those from the individual methods. Results. The recommended results successfully reproduce the atmospheric parameters of the benchmark stars and the expected T-eff-log g relation of the calibrating clusters. Atmospheric parameters and abundances have been determined for 1301 FGK-type stars observed with UVES. The median of the method-to-method dispersion of the atmospheric parameters is 55K for T-eff, 0.13dex for log g and 0.07 dex for [Fe/H]. Systematic biases are estimated to be between 50-100 K for T-eff, 0.10-0.25 dex for log g and 0.05-0.10 dex for [Fe/H]. Abundances for 24 elements were derived: C, N, O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Mo, Ba, Nd, and Eu. The typical method-to-method dispersion of the abundances varies between 0.10 and 0.20 dex. Conclusions. The Gaia-ESO sample of high-resolution spectra of FGK-type stars will be among the largest of its kind analyzed in a homogeneous way. The extensive list of elemental abundances derived in these stars will enable significant advances in the areas of stellar evolution and Milky Way formation and evolution. (Less)
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methods: data analysis, surveys, stars: abundances, stars: fundamental, parameters, stars: late-type
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Astronomy & Astrophysics
volume
570
publisher
EDP Sciences
external identifiers
  • wos:000344158500056
  • scopus:84908409250
ISSN
0004-6361
DOI
10.1051/0004-6361/201423937
language
English
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48e22ecb-1e8f-4721-89f5-7ce6bb0f62ca (old id 4875707)
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2014-12-30 10:39:33
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@article{48e22ecb-1e8f-4721-89f5-7ce6bb0f62ca,
  abstract     = {Context. The ongoing Gaia-ESO Public Spectroscopic Survey is using FLAMES at the VLT to obtain high-quality medium-resolution Giraffe spectra for about 10(5) stars and high-resolution UVES spectra for about 5000 stars. With UVES, the Survey has already observed 1447 FGK-type stars. Aims. These UVES spectra are analyzed in parallel by several state-of-the-art methodologies. Our aim is to present how these analyses were implemented, to discuss their results, and to describe how a final recommended parameter scale is defined. We also discuss the precision (method-to-method dispersion) and accuracy (biases with respect to the reference values) of the final parameters. These results are part of the Gaia-ESO second internal release and will be part of its first public release of advanced data products. Methods. The final parameter scale is tied to the scale defined by the Gaia benchmark stars, a set of stars with fundamental atmospheric parameters. In addition, a set of open and globular clusters is used to evaluate the physical soundness of the results. Each of the implemented methodologies is judged against the benchmark stars to define weights in three different regions of the parameter space. The final recommended results are the weighted medians of those from the individual methods. Results. The recommended results successfully reproduce the atmospheric parameters of the benchmark stars and the expected T-eff-log g relation of the calibrating clusters. Atmospheric parameters and abundances have been determined for 1301 FGK-type stars observed with UVES. The median of the method-to-method dispersion of the atmospheric parameters is 55K for T-eff, 0.13dex for log g and 0.07 dex for [Fe/H]. Systematic biases are estimated to be between 50-100 K for T-eff, 0.10-0.25 dex for log g and 0.05-0.10 dex for [Fe/H]. Abundances for 24 elements were derived: C, N, O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Mo, Ba, Nd, and Eu. The typical method-to-method dispersion of the abundances varies between 0.10 and 0.20 dex. Conclusions. The Gaia-ESO sample of high-resolution spectra of FGK-type stars will be among the largest of its kind analyzed in a homogeneous way. The extensive list of elemental abundances derived in these stars will enable significant advances in the areas of stellar evolution and Milky Way formation and evolution.},
  articleno    = {A122},
  author       = {Smiljanic, R. and Korn, A. J. and Bergemann, M. and Frasca, A. and Magrini, L. and Masseron, T. and Pancino, E. and Ruchti, Gregory and San Roman, I. and Sbordone, L. and Sousa, S. G. and Tabernero, H. and Tautvaisiene, G. and Valentini, M. and Weber, M. and Worley, C. C. and Adibekyan, V. Zh. and Allende Prieto, C. and Barisevicius, G. and Biazzo, K. and Blanco-Cuaresma, S. and Bonifacio, P. and Bragaglia, A. and Caffau, E. and Cantat-Gaudin, T. and Chorniy, Y. and de Laverny, P. and Delgado-Mena, E. and Donati, P. and Duffau, S. and Franciosini, E. and Friel, E. and Geisler, D. and Gonzalez Hernandez, J. I. and Gruyters, P. and Guiglion, G. and Hansen, C. J. and Heiter, U. and Hill, V. and Jacobson, H. R. and Jofre, P. and Jönsson, Henrik and Lanzafame, A. C. and Lardo, C. and Ludwig, H. -G. and Maiorca, E. and Mikolaitis, S. and Montes, D. and Morel, T. and Mucciarelli, A. and Munoz, C. and Nordlander, T. and Pasquini, L. and Puzeras, E. and Recio-Blanco, A. and Ryde, Nils and Sacco, G. and Santos, N. C. and Serenelli, A. M. and Sordo, R. and Soubiran, C. and Spina, L. and Steffen, M. and Vallenari, A. and Van Eck, S. and Villanova, S. and Gilmore, G. and Randich, S. and Asplund, M. and Binney, J. and Drew, J. and Feltzing, Sofia and Ferguson, A. and Jeffries, R. and Micela, G. and Negueruela, I. and Prusti, T. and Rix, H-W. and Alfaro, E. and Babusiaux, C. and Bensby, Thomas and Blomme, R. and Flaccomio, E. and Francois, P. and Irwin, M. and Koposov, S. and Walton, N. and Bayo, A. and Carraro, G. and Costado, M. T. and Damiani, F. and Edvardsson, B. and Hourihane, A. and Jackson, R. and Lewis, J. and Lind, K. and Marconi, G. and Martayan, C. and Monaco, L. and Morbidelli, L. and Prisinzano, L. and Zaggia, S.},
  issn         = {0004-6361},
  keyword      = {methods: data analysis,surveys,stars: abundances,stars: fundamental,parameters,stars: late-type},
  language     = {eng},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {The Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars},
  url          = {http://dx.doi.org/10.1051/0004-6361/201423937},
  volume       = {570},
  year         = {2014},
}