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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

In a framework where galaxies form hierarchically, extended stellar haloes are predicted to be an ubiquitous feature around Milky Way-like galaxies and to consist mainly of the shredded stellar component of smaller galactic systems. The type of accreted stellar systems are expected to vary accord...


Battaglia, G.North, P.Jablonka, P.Shetrone, M.Minniti, D.Díaz, M.Starkenburg, E.Savoy, M.[What is the Milky Way outer halo made of?: High resolution spectroscopy of distant red giants]What is the Milky Way outer halo made of?: High resolution spectroscopy of distant red giants

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