Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 495, Issue 4, Pages 4113-4123Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa1386
Keywords
stars: chemically peculiar; Galaxy: bulge; Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: stellar content
Categories
Funding
- FONDECYT [3180210]
- Becas Iberoamerica Investigador 2019, Banco Santander Chile
- UNAM/PAPIIT [IN105916]
- FAPESP [2017/15893-1]
- DGAPA-PAPIIT [IG100319]
- Fondo Nacional de Financiamiento para la Ciencia, La Tecnologia y la innovacion 'FRANCISCO JOSE DE CALDAS', MINCIENCIAS
- VIIS
- Centre national d' etudes spatiales (CNES) [0101973]
- UTINAM Institute of the Universite de Franche-Comte
- Region de Franche-Comte
- Institut des Sciences de l'Univers (INSU)
- Alfred P. Sloan Foundation
- US Department of Energy Office of Science
- Center for High-Performance Computing at the University of Utah
- Brazilian Participation Group
- Carnegie Institution for Science
- Carnegie Mellon University
- Chilean Participation Group
- French Participation Group
- Harvard-Smithsonian Center for Astrophysics
- Instituto de Astrofisica de Canarias
- Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
- Lawrence Berkeley National Laboratory
- Leibniz Institut f ur Astrophysik Potsdam (AIP)
- Max-Planck-Institut f ur Astronomie (MPIA Heidelberg)
- Max-Planck-Institut f ur Astrophysik (MPA Garching)
- Max-Planck-Institut f ur Extraterrestrische Physik (MPE)
- National Astronomical Observatory of China
- New Mexico StateUniversity
- NewYork University
- University of Dame
- Observatorio Nacional/MCTI
- Ohio StateUniversity
- Pennsylvania State University
- Shanghai Astronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Portsmouth
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
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We have used the galaxy modelling algorithm GRAVPOT16, to explore the most probable orbital elements of a sample of 64 selected N-rich stars across the Milky Way. We use the newly measured proper motions from Gaia Data Release 2 with existing line-of-sight velocities from the second generation of the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) and spectrophotometric distance estimations from STARHORSE. We adopted a set of high-resolution particle simulations evolved in the same steady-state Galactic potential model with a bar, in order to identify the groups of N-rich stars that have a high probability of belonging to the bulge/bar, disc and stellar halo component. We find that the vast majority of the N-rich stars show typically maximum height from the Galactic plane below 3 kpc, and develop eccentric orbits (e > 0.5), which means that these stars appear to have bulge/bar-like and/or halo-like orbits. We also show that similar to 66 per cent of the selected N-rich stars currently reside in the inner Galaxy inside the corotation radius, whilst similar to 14 per cent are in halo-like orbits. Among the N-rich stars in the inner Galaxy, similar to 27 per cent share orbital properties in the boundary between bulge/bar and disc, depending on the bar pattern speeds. Our dynamical analysis also indicates that some of the N-rich stars are likely to be halo interlopers, which suggests that halo contamination is not insignificant within the bulge area.
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