The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk
Maria Bergemann,Gregory R. Ruchti,Aldo Serenelli,Sofia Feltzing,Alan Alves-Brito,Martin Asplund,Thomas Bensby,P. Gruiters,Ulrike Heiter,Andreas Korn,Karin Lind,A. F. Marino,Paula Jofre,Thomas Nordlander,Nils Ryde,Gerard Gilmore,Sofia Randich,Annette M. N. Ferguson,R. D. Jeffries,Giuseppina Micela,Ignacio Negueruela,T. Prusti,Hans-Walter Rix,Antonella Vallenari,Emilio J. Alfaro,C. Allende Prieto,Angela Bragaglia,Sergey E. Koposov,A. C. Lanzafame,Elena Pancino,Alejandra Recio-Blanco,Rodolfo Smiljanic,N. A. Walton,M. T. Costado,E. Franciosini,Vanessa Hill,Carmela Lardo,P. de Laverny,Laura Magrini,Enrico Maiorca,Thomas Masseron,L. Morbidelli,G. G. Sacco,Georges Kordopatis,Grazina Tautvaisiene +44 more
TLDR
In this article, the relationship between age, metallicity, and alpha enhancement of FGK stars in the Galactic disk was studied based on the analysis of high-resolution UVES spectra from the Gaia-ESO large stellar survey.Abstract:
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 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.read more
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Journal ArticleDOI
Chemical Cartography with APOGEE: Metallicity Distribution Functions and the Chemical Structure of the Milky Way Disk
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Journal ArticleDOI
The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
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Journal ArticleDOI
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