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Smiljanic, R.Franciosini, E.Randich, S.Magrini, L.Bragaglia, A.Pasquini, L.Vallenari, A.Tautvaišienė, G.Biazzo, K.Frasca, A.Donati, P.Delgado Mena, E.Casey, A. R.Geisler, D.Villanova, S.Tang, B.Sousa, S. G.Gilmore, G.Bensby, T.François, P.Koposov, S. E.Lanzafame, A. C.Pancino, E.Recio-Blanco, A.Costado, M. T.Hourihane, A.Lardo, C.de Laverny, P.Lewis, J.Monaco, L.Morbidelli, L.Sacco, G. G.Worley, C. C.Zaggia, S.Martell, S.[The Gaia-ESO Survey: Inhibited extra mixing in two giants of the open cluster Trumpler 20?]The Gaia-ESO Survey: Inhibited extra mixing in two giants of the open cluster Trumpler 20?

We find two chemically distinct populations separated relatively cleanly in the [Fe/H]-[Mg/Fe] plane, but also distinguished in other chemical planes, among metal-poor stars (primarily with metallicities [Fe H] < -0.9) observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE...


Hayes, C.R.Majewski, S.R.Shetrone, M.Fernández-Alvar, E.Prieto, C.A.Schuster, W.J.Carigi, L.Cunha, K.Smith, V.V.Sobeck, J.Almeida, A.Beers, T.C.Carrera, R.Fernández-Trincado, J.G.García-Hernández, D.A.Geisler, D.Lane, R.R.Lucatello, S.Matthews, A.M.Minniti, D.Nitschelm, C.Tang, B.Tissera, P.B.Zamora, O.[Disentangling the Galactic Halo with APOGEE. I. Chemical and Kinematical Investigation of Distinct Metal-poor Populations]Disentangling the Galactic Halo with APOGEE. I. Chemical and Kinematical Investigation of Distinct Metal-poor Populations

The formation processes that led to the current Galactic stellar halo are still under debate. Previous studies have provided evidence for different stellar populations in terms of elemental abundances and kinematics, pointing to different chemical and star formation histories (SFHs). In the prese...


Fernández-Alvar, E.Carigi, L.Schuster, W.J.Hayes, C.R.Ávila-Vergara, N.Majewski, S.R.Allende Prieto, C.Beers, T.C.Sánchez, S.F.Zamora, O.García-Hernández, D.A.Tang, B.Fernández-Trincado, J.G.Tissera, P.Geisler, D.Villanova, S.[Disentangling the Galactic Halo with APOGEE. II. Chemical and Star Formation Histories for the Two Distinct Populations]Disentangling the Galactic Halo with APOGEE. II. Chemical and Star Formation Histories for the Two Distinct Populations

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