期刊
ASTROPHYSICAL JOURNAL
卷 852, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa9ced
关键词
Galaxy: evolution; Galaxy: halo; stars: abundances
资金
- DGAPA-UNAM
- CONACyT of Mexico [241732]
- PAPIIT of Mexico [IG100115, IA101215, IA101517, IN103014]
- MINECO of Spain [AYA2015-65205-P]
- NSF [AST-1312863, AST-1616636]
- Spanish Government [AYA-2014-56359-P]
- Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE)
- US National Science Foundation
- Ramn y Cajal fellowship [RYC-2013-14182]
- Spanish Ministry of Economy and Competitiveness (MINECO) [AYA-2014-58082-P]
- Chilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA) grant [PFB-06/2007]
- Fondecyt [1170518]
- Alfred P. Sloan Foundation
- U.S. 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 fur Astrophysik Potsdam (AIP)
- Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
- Max-Planck-Institut fur Astrophysik (MPA Garching)
- Max-Planck-Institut fur Extraterrestrische Physik (MPE)
- National Astronomical Observatories of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatario Nacional/MCTI
- Ohio State University
- 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
- [PHY 14-30152]
- Direct For Mathematical & Physical Scien [1430152] Funding Source: National Science Foundation
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 present work, we explore, over a broader range in metallicity (-2.2<[Fe/H]<+ 0.5), the two stellar populations detected in the first paper of this series from metal-poor stars in DR13 of the Apache Point Observatory Galactic Evolution Experiment (APOGEE). We aim to infer signatures of the initial mass function (IMF) and the SFH from the two alpha -to-iron versus iron abundance chemical trends for the most APOGEE-reliable a-elements (O, Mg, Si, and Ca). Using simple chemical-evolution models, we infer the upper mass limit (M-up) for the IMF and the star formation rate, and its duration for each population. Compared with the low-alpha population, we obtain a more intense and longer-lived SFH, and a top-heavier IMF for the high-alpha population.
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