English

Solar models with new low-metal abundances

Solar and Stellar Astrophysics 2016-04-27 v1

Abstract

In the last decade, the photospheric abundances of the Sun had been revised several times by many observers. The standard solar models (SSM) constructed with the new low-metal abundances disagree with helioseismic results and detected neutrino fluxes. The solar model problem has been puzzled some stellar physicists for more than ten years. Rotation, enhanced diffusion, convection overshoot, and magnetic fields are used to reconcile the new abundances with helioseismology. The \textbf{too} low-helium \textbf{subsurface abundance} in enhanced diffusion models can be improved by the mixing caused by rotation and magnetic fields. The problem of the depth of the convective zone in rotating models can be resolved by convection overshoot. Consequently the Asplund-Grevesse-Sauval rotation model including overshooting (AGSR) reproduces the seismically inferred sound-speed and density profiles, and the convection zone depth as well as the Grevesse and Sauval (GS98) model computed before. But this model fails to reproduce the surface helium abundance which is 0.2393 (2.62.6 σ\sigma away from the seismic value) and neutrino fluxes. The magnetic model called AGSM keeps the agreement of the AGSR and improves the prediction of the surface helium abundance. The observed separation ratios r02r_{02} and r13r_{13} are reasonably reproduced by AGSM. Moreover, neutrino fluxes calculated by this model are not far from the detected neutrino fluxes and the predictions of previous works.

Keywords

Cite

@article{arxiv.1603.01666,
  title  = {Solar models with new low-metal abundances},
  author = {Wuming Yang},
  journal= {arXiv preprint arXiv:1603.01666},
  year   = {2016}
}

Comments

Acceptance for publication in ApJ. 16 pages, 7 figures, 2 tables

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