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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

We report the first estimate of the He abundance of the population of RR Lyrae stars in the Galactic bulge. This is done by comparing the recent observational data with the latest models. We use the large samples of ab-type RR Lyrae stars found by OGLE IV in the inner bulge and by the VVV survey ...


Marconi, M.Minniti, D.[Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars]Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars

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

We search for microlensing events in the highly reddened areas surrounding the Galactic center using the near-IR observations with the VISTA Variables in the Vía Láctea Survey (VVV). We report the discovery of 182 new microlensing events, based on observations acquired between 2010 and 2015. We p...


Navarro, M.G.Minniti, D.Ramos, R.C.[VVV Survey Microlensing Events in the Galactic Center Region]VVV Survey Microlensing Events in the Galactic Center Region

We search for extragalactic sources in the VISTA Variables in the Vía Láctea survey that are hidden by the Galaxy. Herein, we describe our photometric procedure to find and characterize extragalactic objects using a combination of SExtractor and PSFEx. It was applied in two tiles of the survey: d...


Baravalle, L.D.Alonso, M.V.Castellón, J.L.N.Beamín, J.C.Minniti, D.[Searching for extragalactic sources in the VISTA variables in the Via láctea survey]Searching for extragalactic sources in the VISTA variables in the Via láctea survey

We present VIRAC version 1, a near-infrared proper motion and parallax catalogue of the VISTA Variables in the Via Lactea (VVV) survey for 312 587 642 unique sources averaged across all overlapping pawprint and tile images covering 560 deg2 of the bulge of the MilkyWay and southern disc. The cata...


Smith, L.C.Lucas, P.W.Kurtev, R.Smart, R.Minniti, D.Borissova, J.Jones, H.R.A.Zhang, Z.H.Marocco, F.Contreras Peña, C.Gromadzki, M.Kuhn, M.A.Drew, J.E.Pinfield, D.J.Bedin, L.R.[VIRAC: The VVV Infrared Astrometric Catalogue]VIRAC: The VVV Infrared Astrometric Catalogue

We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy campaign performed at seven telescopes in the northern and southern hemispheres. These objects were detected with the Burst Alert Telescope (BAT) instrument onboard the Swift satellite and listed as o...


Rojas, A.F.Masetti, N.Minniti, D.Jiménez-Bailón, E.Chavushyan, V.Hau, G.McBride, V.A.Bassani, L.Bazzano, A.Bird, A.J.Galaz, G.l.Gavignaud, I.Landi, R.Malizia, A.Morelli, L.Palazzi, E.Patiño-Álvarez, V.Stephen, J.B.Ubertini, P.[The nature of 50 Palermo Swift -BAT hard X-ray objects through optical spectroscopy]The nature of 50 Palermo Swift -BAT hard X-ray objects through optical spectroscopy

Context. Our view of the structure of the Milky Way and, in particular, its bulge is obscured by the intervening stars, dust, and gas in the disc. While great progress in understanding the bulge has been achieved with past and ongoing observations, the comparison of its global chemodynamical prop...


Gonzalez, O.A.Gadotti, D.A.Debattista, V.P.Rejkuba, M.deValenti, E.Zoccali, M.Coccato, L.Minniti, D.Ness, M.[Comparing the properties of the X-shaped bulges of NGC 4710 and the Milky Way with MUSE]Comparing the properties of the X-shaped bulges of NGC 4710 and the Milky Way with MUSE

Context. The VISTA Variables in the Vía Láctea (VVV) is a near-IR time-domain survey of the Galactic bulge and southern plane. One of the main goals of this survey is to reveal the 3D structure of the Milky Way through their variable stars. In particular, enormous numbers of RR Lyrae stars have b...


Gran, F.Minniti, D.Saito, R. K.Zoccali, M.Gonzalez, O. A.Navarrete, C.Catelan, M.Contreras Ramos, R.Elorrieta, F.Eyheramendy, S.Jordán, A.[Mapping the outer bulge with RRab stars from the VVV Survey]Mapping the outer bulge with RRab stars from the VVV Survey

Hoyer, S.López Morales, M.Rojo Rubke, PatricioMinniti, D.Adams, E. R.[TraMoS - IV. Discarding the Quick Orbital Decay Hypothesis for OGLE-TR-113b]

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