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Schiappacasse-Ulloa, J.Tang, B.Fernández-Trincado, J.G.Zamora, O.Geisler, D.Frinchaboy, P.Schultheis, M.Dell'Agli, F.Villanova, S.Masseron, T.Mészáros, S.Souto, D.Hasselquist, S.Cunha, K.Smith, V.V.García-Hernández, D.A.Vieira, K.Robin, A.C.Minniti, D.Zasowski, G.Moreno, E.Pérez-Villegas, A.Lane, R.R.Ivans, I.I.Pan, K.Nitschelm, C.Santana, F.A.Carrera, R.Roman-Lopes, A.[A Chemical and Kinematical Analysis of the Intermediate-age Open Cluster IC 166 from APOGEE and Gaia DR2]A Chemical and Kinematical Analysis of the Intermediate-age Open Cluster IC 166 from APOGEE and Gaia DR2

Context. Low-mass dwarf spheroidal galaxies are key objects for our understanding of the chemical evolution of the pristine Universe and the Local Group of galaxies. Abundance ratios in stars of these objects can be used to better understand their star formation and chemical evolution. Aims. We r...


François, P.Monaco, L.Bonifacio, P.Moni Bidin, C.Geisler, D.[Abundance ratios of red giants in low-mass ultra-faint dwarf spheroidal galaxies]Abundance ratios of red giants in low-mass ultra-faint dwarf spheroidal galaxies

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?

NGC 6791 is a unique stellar cluster, key to our understanding of both the multiple stellar population phenomenon and the evolution and assembly of the Galaxy. However, despite many investigations, its nature is still very controversial. Geisler et al. found evidence suggesting that it was the fi...


Villanova, S.Carraro, G.Geisler, D.Monaco, L.Assmann, P.[NGC 6791: A Probable Bulge Cluster without Multiple Populations]NGC 6791: A Probable Bulge Cluster without Multiple Populations

We present wide-field JHKS photometry of 16 Galactic globular clusters located towards the Galactic bulge, calibrated on the Two Micron All-Sky Survey photometric system. Differential reddening corrections and statistical field star decontamination are employed for all of these clusters before fi...


Cohen, R.E.Bidin, C.M.Mauro, F.Bonatto, C.Geisler, D.[Near-infrared photometry of globular clusters towards the Galactic bulge: Observations and photometric metallicity indicators]Near-infrared photometry of globular clusters towards the Galactic bulge: Observations and photometric metallicity indicators

It is likely that a number of Galactic globular clusters remain to be discovered, especially toward the Galactic bulge. High stellar density combined with high and differential interstellar reddening are the two major problems for finding globular clusters located toward the bulge. We use the dee...


Minniti, D.Geisler, D.Alonso-Garcia, J.Palma, T.Beamin, J.C.Borissova, J.Catelan, M.Clariá, J.J.Cohen, R.E.Ramos, R.C.Dias, B.Fernández-Trincado, J.G.Gómez, M.Hempel, M.Ivanov, V.D.Kurtev, R.Lucas, P.W.Moni-Bidin, C.Pullen, J.Alegria, S.R.Saito, R.K.Valenti, E.[New VVV Survey Globular Cluster Candidates in the Milky Way Bulge]New VVV Survey Globular Cluster Candidates in the Milky Way Bulge

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

Context. The tidal disruption of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) is producing the most prominent substructure in the Milky Way (MW) halo, the Sagittarius Stream. Aside from field stars, it is suspected that the Sgr dSph has lost a number of globular clusters (GC). Many Galactic...


Sbordone, L.Monaco, L.Moni Bidin, C.Bonifacio, P.Villanova, S.Bellazzini, M.Ibata, R.Chiba, M.Geisler, D.Caffau, E.Duffau, S.[Chemical abundances of giant stars in NGC 5053 and NGC 5634, two globular clusters associated with the Sagittarius dwarf spheroidal galaxy?]Chemical abundances of giant stars in NGC 5053 and NGC 5634, two globular clusters associated with the Sagittarius dwarf spheroidal galaxy?

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