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Exploring mass loss, low-Z accretion, and convective overshoot in solar models to mitigate the solar abundance problem | | Joyce Ann Guzik
; Katie Mussack
; | | Date: |
5 Jan 2010 | | Abstract: | Solar models using the new lower abundances of Asplund et al. (2005) or
Asplund et al. (2009) do not agree as well with helioseismic inferences as
models that use the higher Grevesse & Noels (1993) or Grevesse & Sauval (1998)
abundances. Adopting the new abundances leads to models with sound speed
discrepancies of up to 1.4% below the base of the convection zone (compared to
discrepancies of less than 0.4% with the old abundances), a convection zone
that is too shallow, and a convection zone helium abundance that is too low.
Here we review breifly previous attempts to restore agreement, and we evaluate
three suggested changes to the models: early mass loss, accretion of low-Z
material, and convective overshoot. One goal of these attempts is to explore
models that could preserve the structure in the interior obtained with the old
abundances while accomodating the new abundances at the surface. Although the
mass-losing and accretion models show some improvement in agreement with
seismic constraints, a satisfactory resolution to the solar abundance problem
remains to be found. | | Source: | arXiv, 1001.0648 | | Services: | Forum | Review | PDF | Favorites | |
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