Solar model: Element diffusion or metal-enhanced envelope?

Yang, Jiayan; Li, Y.; Xu, Haiqing

doi:10.1051/0004-6361:20000290

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…The code originally written by Paczyński (1969Paczyński ( , 1970 was updated by Sienkiewicz in 1995 and Yang et al (2001). We modified it to incorporate the hydrostatic effects of rotation on the equations of stellar structure, using the method of Kippenhahn-Meynet (Kippenhahn & Thomas 1970;Meynet & Maeder 1997).…”

Section: Choice Of Parametersmentioning

confidence: 99%

Angular momentum transport and element mixing in the stellar interior

Yang

2006

A&A

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Aims. The purpose of this work was to obtain diffusion coefficient for the magnetic angular momentum transport and material transport in a rotating solar model. Methods. We assumed that the transport of both angular momentum and chemical elements caused by magnetic fields could be treated as a diffusion process. Results. The diffusion coefficient depends on the stellar radius, angular velocity, and the configuration of magnetic fields. By using of this coefficient, it is found that our model becomes more consistent with the helioseismic results of total angular momentum, angular momentum density, and the rotation rate in a radiative region than the one without magnetic fields. Not only can the magnetic fields redistribute angular momentum efficiently, but they can also strengthen the coupling between the radiative and convective zones. As a result, the sharp gradient of the rotation rate is reduced at the bottom of the convective zone. The thickness of the layer of sharp radial change in the rotation rate is about 0.036 R in our model. Furthermore, the difference of the sound-speed square between the seismic Sun and the model is improved by mixing the material that is associated with angular momentum transport.

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Section: Choice Of Parametersmentioning

confidence: 99%

Angular momentum transport and element mixing in the stellar interior

Yang

2006

A&A

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“…There is significant motivation for reconsidering low‐ Z models in future studies of the Sun's interior. The most immediate need is for new sets of self‐consistent evolved low‐ Z models, incorporating improved physics since the study of Yang et al (2001). Additional progress will come from new neutrino experiments, continued comparison of helioseismic data with models having a range of element mixtures, and improved measurements of O and Ne abundances in the Sun's photosphere and chromosphere.…”

Section: Discussionmentioning

confidence: 99%

“…Yang, Li & Xu (2001) compared three solar models to helioseismic data: SSM, element diffusion and metal‐enriched convection zone. Their results indicate that a model with an enriched convection zone gives similarly good agreement to helioseismic data as does a model with diffusion; both result in decreased helium abundance in the convective zone and deepening of the convection zone relative to their SSM.…”

Section: Introductionmentioning

confidence: 99%

The Sun's interior metallicity constrained by neutrinos

González

2006

Monthly Notices of the Royal Astronomical Society: Letters

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Observed solar neutrino fluxes are employed to constrain the interior composition of the Sun. Including the effects of neutrino flavour mixing, the results from Homestake, Sudbury and Gallium experiments constrain the Mg, Si and Fe abundances in the solar interior to be within a factor of 0.89 to 1.34 of the surface values with 68 per cent confidence. If the O and/or Ne abundances are increased in the interior to resolve helioseismic discrepancies with recent standard solar models, then the nominal interior Mg, Si and Fe abundances are constrained to a range of 0.83 to 1.24 relative to the surface. Additional research is needed to determine whether the Sun's interior is metal‐poor relative to its surface.

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Lost siblings of the Sun: Revisiting the FGK potential candidates

Batista

Fernandes

2012

New Astronomy

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Solar model: Element diffusion or metal-enhanced envelope?

Cited by 5 publications

References 21 publications

Angular momentum transport and element mixing in the stellar interior

Angular momentum transport and element mixing in the stellar interior

The Sun's interior metallicity constrained by neutrinos

Lost siblings of the Sun: Revisiting the FGK potential candidates

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