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Search: onr:"swepub:oai:DiVA.org:uu-228484" > The Gaia-ESO Survey :

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  • Bergemann, M. (author)

The Gaia-ESO Survey : radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk

  • Article/chapterEnglish2014

Publisher, publication year, extent ...

  • 2014-05-15
  • EDP Sciences,2014
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-228484
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-228484URI
  • https://doi.org/10.1051/0004-6361/201423456DOI
  • https://lup.lub.lu.se/record/4552152URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We study the relationship between age, metallicity, and alpha-enhancement of FGK stars in the Galactic disk. The results are based upon the analysis of high-resolution UVES spectra from the Gaia-ESO large stellar survey. We explore the limitations of the observed dataset, i.e. the accuracy of stellar parameters and the selection effects that are caused by the photometric target preselection. We find that the colour and magnitude cuts in the survey suppress old metal-rich stars and young metal-poor stars. This suppression may be as high as 97% in some regions of the age-metallicity relationship. The dataset consists of 144 stars with a wide range of ages from 0.5 Gyr to 13.5 Gyr, Galactocentric distances from 6 kpc to 9.5 kpc, and vertical distances from the plane 0 < vertical bar Z vertical bar < 1.5 kpc. On this basis, we find that i) the observed age-metallicity relation is nearly flat in the range of ages between 0 Gyr and 8 Gyr; ii) at ages older than 9 Gyr, we see a decrease in [Fe/H] and a clear absence of metal-rich stars; this cannot be explained by the survey selection functions; iii) there is a significant scatter of [Fe/H] at any age; and iv) [Mg/Fe] increases with age, but the dispersion of [Mg/Fe] at ages > 9 Gyr is not as small as advocated by some other studies. In agreement with earlier work, we find that radial abundance gradients change as a function of vertical distance from the plane. The [Mg/Fe] gradient steepens and becomes negative. In addition, we show that the inner disk is not only more alpha-rich compared to the outer disk, but also older, as traced independently by the ages and Mg abundances of stars.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Ruchti, GregoryLund 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-grh (author)
  • Serenelli, A. (author)
  • Feltzing, SofiaLund 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-sfe (author)
  • Alves-Brito, A. (author)
  • Asplund, M. (author)
  • Bensby, ThomasLund 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)
  • Gruyters, PieterUppsala universitet,Institutionen för fysik och astronomi(Swepub:uu)petgr245 (author)
  • Heiter, UlrikeUppsala universitet,Observationell astrofysik(Swepub:uu)ulhei450 (author)
  • Hourihane, A. (author)
  • Korn, AndreasUppsala universitet,Teoretisk astrofysik(Swepub:uu)ankor103 (author)
  • Lind, K. (author)
  • Marino, A. (author)
  • Jofre, P. (author)
  • Nordlander, T.Uppsala universitet,Institutionen för fysik och astronomi (author)
  • Ryde, NilsLund 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-nlr (author)
  • Worley, C. C. (author)
  • Gilmore, G. (author)
  • Randich, S. (author)
  • Ferguson, A. M. N. (author)
  • Jeffries, R. D. (author)
  • Micela, G. (author)
  • Negueruela, I. (author)
  • Prusti, T. (author)
  • Rix, H. -W (author)
  • Vallenari, A. (author)
  • Alfaro, E. J. (author)
  • Allende Prieto, C. (author)
  • Bragaglia, A. (author)
  • Koposov, S. E. (author)
  • Lanzafame, A. C. (author)
  • Pancino, E. (author)
  • Recio-Blanco, A. (author)
  • Smiljanic, R. (author)
  • Walton, N. (author)
  • Costado, M. T. (author)
  • Franciosini, E. (author)
  • Hill, V. (author)
  • Lardo, C. (author)
  • de Laverny, P. (author)
  • Magrini, L. (author)
  • Maiorca, E. (author)
  • Masseron, T. (author)
  • Morbidelli, L. (author)
  • Sacco, G. (author)
  • Kordopatis, G. (author)
  • Tautvaisiene, G. (author)
  • Astronomi - Genomgår omorganisationInstitutionen för astronomi och teoretisk fysik - Genomgår omorganisation (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences565, s. A89-0004-63611432-0746

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