Journal
ASTROPHYSICAL JOURNAL
Volume 840, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa6a1e
Keywords
stars: evolution; stars: fundamental parameters
Categories
Funding
- 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 Astroffsica 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 Observatory 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 [NNX15AF13G, NAS5-26555, NNX16AI09G, NNX12AE17G]
- NSF [AST-1211673, AST-1514676, AST-1411685]
- European Research Council under the European Community's Seventh Framework Programme (FP7)/ERC [338251]
- Vanderbilt Office of the Provost through the Vanderbilt Initiative in Data-intensive Astrophysics (VIDA)
- Premium Postdoctoral Research Program of the Hungarian Academy of Sciences
- Hungarian NKFI of the Hungarian National Research, Development and Innovation Office [K-119517]
- Ramon y Cajal fellowship [RYC-2013-14182]
- Spanish Ministry of Economy and Competitiveness (MINECO) [AYA-2014-58082-P, AYA2014-56359-P]
- NASA through Hubble Fellowship by the Space Telescope Science Institute [HST-HF2-51335]
- CNES
- NASA's Science Mission Directorate
- Danish National Research Foundation [DNRF106]
- VILLUM FONDEN [10118]
- Gemini-CONICYT [32140007]
- Generalitat de Catalunya [2014-SGR-1458]
- MINECO [ESP2014-56003-R, ESP2015-66134-R]
- Australian Research Council's Discovery Projects [DE140101364]
- STFC [ST/N000668/1, ST/M00077X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/N000668/1, ST/M00077X/1] Funding Source: researchfish
- Villum Fonden [00010118] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1109612] Funding Source: National Science Foundation
Ask authors/readers for more resources
In the updated APOGEE-Kepler catalog, we have asteroseismic and spectroscopic data for over 3000 first ascent red giants. Given the size and accuracy of this sample, these data offer an unprecedented test of the accuracy of stellar models on the post-main-sequence. When we compare these data to theoretical predictions, we find a metallicity dependent temperature offset with a slope of around 100 K per dex in metallicity. We find that this effect is present in all model grids tested, and that theoretical uncertainties in the models, correlated spectroscopic errors, and shifts in the asteroseismic mass scale are insufficient to explain this effect. Stellar models can be brought into agreement with the data if a metallicity-dependent convective mixing length is used, with Delta alpha(ML), YREC similar to 0.2 per dex in metallicity, a trend inconsistent with the predictions of three-dimensional stellar convection simulations. If this effect is not taken into account, isochrone ages for red giants from the Gaia data will be off by as much as a factor of two even at modest deviations from solar metallicity ([Fe/H]- -0.5).
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