Rotating Solar Models with Low Metal Abundances as Good as Those with High Metal Abundances

Standard solar models (SSMs) constructed in accord with low metal abundances disagree with seismically inferred results. We constructed rotating solar models with low metal abundances that included enhanced settling and convection overshoot. In one of our rotating models, AGSSr2a, the convection ove...

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Bibliographic Details
Published in:The Astrophysical journal 2019-03, Vol.873 (1), p.18
Main Author: Yang, Wuming
Format: Article
Language:English
Subjects:
Abundance
Astrophysics
Convection
Density
Fluxes
Helium
Metals
Neutrinos
Predictions
Rotation
Settling
Solar models
Sound
Sun: abundances
Sun: helioseismology
Sun: interior
Sun: rotation
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Summary:Standard solar models (SSMs) constructed in accord with low metal abundances disagree with seismically inferred results. We constructed rotating solar models with low metal abundances that included enhanced settling and convection overshoot. In one of our rotating models, AGSSr2a, the convection overshoot allowed us to recover the radius of the base of the convection zone (CZ) at a level of 1 . The rotational mixing almost completely counteracts the enhanced settling for the surface helium abundance, but only partially for the surface heavy-element abundance. At the 1 level, the combination of rotation and enhanced settling brings the surface helium abundance into agreement with the seismically inferred value of 0.2485 0.0035, and makes the model have better sound-speed and density profiles than SSMs constructed in accordance with high metal abundances. The radius of the base of the CZ and the surface helium abundance of AGSSr2a are 0.713 R and 0.2472, respectively; the absolute values of the relative differences in sound speed and density between it and the Sun are less than 0.0025 and 0.015, respectively. Moreover, the predicted neutrino fluxes of our model are comparable with the predictions of previous studies.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab02fc