期刊
ASTRONOMICAL JOURNAL
卷 161, 期 3, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-3881/abd39d
关键词
Stellar ages; Stellar abundances; Asteroseismology; Galaxy evolution; Galaxy formation; Milky Way formation; Galaxy stellar content; Red giant stars; Surveys
资金
- 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
- The Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
- Korean Participation Group
- 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 Extra-terrestrische 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
- NASA [80NSSC19K0115]
- PLATO CNES grant
- Spanish Ministry through the Ramon y Cajal fellowship [RYC-2015-17697]
- State Research Agency (AEI) of the Spanish Ministry of Science, Innovation and Universities (MCIU)
- European Regional Development Fund (FEDER) [AYA2017-88254-P]
This study explores the relationships between the chemistry, ages, and locations of stars in the Galaxy using asteroseismic and spectroscopic data, finding that stars with high [alpha/Fe] tend to be older. The research provides age estimates for red giant branch stars in the Kepler field and suggests that including the effect of alpha-enrichment on opacity can lead to up to 10% older ages for low-mass stars. Age distributions for low- and high-[alpha/Fe] stars converge as distance from the Galactic plane increases, indicating potential unevenness in star formation or radial migration in the Galaxy.
We explore the relationships between the chemistry, ages, and locations of stars in the Galaxy using asteroseismic data from the K2 mission and spectroscopic data from the Apache Point Galactic Evolution Experiment survey. Previous studies have used giant stars in the Kepler field to map the relationship between the chemical composition and the ages of stars at the solar circle. Consistent with prior work, we find that stars with high [alpha/Fe] have distinct, older ages in comparison to stars with low [alpha/Fe]. We provide age estimates for red giant branch (RGB) stars in the Kepler field, which support and build upon previous age estimates by taking into account the effect of alpha-enrichment on opacity. Including this effect for [alpha/Fe]-rich stars results in up to 10% older ages for low-mass stars relative to corrected solar mixture calculations. This is a significant effect that Galactic archeology studies should take into account. Looking beyond the Kepler field, we estimate ages for 735 RGB stars from the K2 mission, mapping age trends as a function of the line of sight. We find that the age distributions for low- and high-[alpha/Fe] stars converge with increasing distance from the Galactic plane, in agreement with suggestions from earlier work. We find that K2 stars with high [alpha/Fe] appear to be younger than their counterparts in the Kepler field, overlapping more significantly with a similarly aged low-[alpha/Fe] population. This observation may suggest that star formation or radial migration proceeds unevenly in the Galaxy.
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