Journal article
The Similarity of Abundance Ratio Trends and Nucleosynthetic Patterns in the Milky Way Disk and Bulge
The Astrophysical journal, Vol.909(1), p.77
03/01/2021
DOI: 10.3847/1538-4357/abd6be
Abstract
We compare abundance ratio trends in a sample of similar to 11,000 Milky Way bulge stars (R-GC < 3 kpc) from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) to those of APOGEE stars in the Galactic disk (5 kpc < R-GC < 11 kpc). We divide each sample into low-Ia (high-[Mg/Fe]) and high-Ia (low-[Mg/Fe]) populations, and in each population, we examine the median trends of [X/Mg] versus [Mg/H] for elements X = Fe, O, Na, Al, Si, P, S, K, Ca, V, Cr, Mn, Co, Ni, Cu, and Ce. To remove small systematic trends of APOGEE abundances with stellar log(g), we resample the disk stars to match the log(g) distributions of the bulge data. After doing so, we find nearly identical median trends for low-Ia disk and bulge stars for all elements. High-Ia trends are similar for most elements, with noticeable (0.05-0.1 dex) differences for Mn, Na, and Co. The close agreement of abundance trends (with typical differences less than or similar to 0.03 dex) implies that similar nucleosynthetic processes enriched bulge and disk stars despite the different star formation histories and physical conditions of these regions. For example, we infer that differences in the high-mass slope of the stellar initial mass function between disk and bulge must have been less than or similar to 0.30. This agreement, and the generally small scatter about the median sequences, means that one can predict all of a bulge star's APOGEE abundances with good accuracy knowing only its measured [Mg/Fe] and [Mg/H] and the observed trends of disk stars.
Details
- Title: Subtitle
- The Similarity of Abundance Ratio Trends and Nucleosynthetic Patterns in the Milky Way Disk and Bulge
- Creators
- Emily Griffith - The Ohio State UniversityDavid H. Weinberg - The Ohio State UniversityJennifer A. Johnson - The Ohio State UniversityRachael Beaton - Carnegie ObservatoriesD. A. Garcia-Hernandez - IACSten Hasselquist - University of UtahJon Holtzman - New Mexico State UniversityJames W. Johnson - The Ohio State UniversityHenrik Jonsson - Malmö UniversityRichard R. Lane - University of AtacamaDavid M. Nataf - Johns Hopkins UniversityAlexandre Roman-Lopes - University of La Serena
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.909(1), p.77
- Publisher
- IOP Publishing Ltd
- DOI
- 10.3847/1538-4357/abd6be
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Number of pages
- 25
- Grant note
- University of Notre Dame New York University Universidad Nacional Autonoma de Mexico University of Utah Harvard-Smithsonian Center for Astrophysics; Smithsonian Institution Lawrence Berkeley National Laboratory; United States Department of Energy (DOE) AST-1801940 / NSF Astronomy and Astrophysics Postdoctoral Fellowship; National Science Foundation (NSF) 130001 / Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) through QUIMAL project; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) Observatario Nacional/MCTI State Research Agency (AEI) of the Spanish Ministry of Science, Innovation and Universities (MCIU); Spanish Government
- Language
- English
- Date published
- 03/01/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701830802771
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