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Tayar, Jamie; Somers, Garrett; Pinsonneault, Marc H.; Stello, Dennis; Mints, Alexey; Johnson, Jennifer A.; Zamora, O.; García-Hernández, D. A.; Maraston, Claudia; Serenelli, Aldo; Prieto, Carlos Allende; Bastien, Fabienne A.; Basu, Sarbani; Bird, J. C.; Cohen, R. E.; Cunha, Katia; Elsworth, Yvonne; García, Rafael A.; Girardi, Leo; Hekker, Saskia; Holtzman, Jon; Huber, Daniel; Mathur, Savita; Mészáros, Szabolcs; Mosser, B.; Shetrone, Matthew; Aguirre, Victor Silva; Stassun, Keivan; Stringfellow, Guy S.; Zasowski, Gail ... view all 31 authors View less authors (2017)
Publisher: HAL CCSD
Languages: English
Types: Preprint
Subjects: Astrophysics - Solar and Stellar Astrophysics, [SDU] Sciences of the Universe [physics], [ SDU ] Sciences of the Universe [physics]

Classified by OpenAIRE into

arxiv: Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Galaxy Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics
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_{\rm ML, YREC} \sim 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 2 even at modest deviations from solar metallicity ([Fe/H]=$-$0.5).
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