Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low abundances of heavy elements in the solar outer layers: comparisons
  of solar models with helioseismic inversions   Recent solar photospheric abundance analyses have led to a significant
reduction of the metal abundances compared to the previous determinations. The
solar models computed with standard opacities and diffusion processes using
these new abundances give poor agreement with helioseismic inversions for the
sound-speed profile, the surface helium abundance, and the convective zone
depth.
  We attempt to obtain a good agreement between helioseismic inversions and
solar models which present the "old" mixture in the interior and new chemical
composition in the convective zone. To reach this result, we assume an
undermetallic accretion at the beginning of the main sequence.
  We compute solar models with the Toulouse-Geneva Evolution Code, in which we
simulate an undermetallic accretion in the early stages of the main sequence,
in order to obtain new mixture in the outer convective zone. We compare the
sound-speed profile, the convective zone depth, and the surface helium
abundance with those deduced from helioseismology.
  The model with accretion but without any mixing process inside is in better
agreement with helioseismology than the solar model with the new abundances
throughout. There is, however, a spike under the convective zone which reaches
3.4%. Furthermore, the convective zone depth and the surface helium abundance
are too low. Introducing undershooting below the convective zone allows us to
recover the good convective zone radius and the addition of rotation-induced
mixing and tachocline allows us to reconcile the surface helium abundance. But
in any case the agreement of the sound-speed profile with helioseismic
inference is worse than obtained with the old abundances.

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The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph