Low heavy-element photospheric abundance: a challenge for solar modeling

Details Low heavy-element photospheric abundance: a challenge for solar modeling Low heavy-element photospheric abundance: a challenge for solar modeling

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.328...23a&link_type=abstract

Astrophysics and Space Science, Volume 328, Issue 1-2, pp. 23-27

Astronomy and Astrophysics

Astrophysics

1

Sun, Opacity, Equation Of State, Abundances

Scientific paper

Recent spectroscopic data pointing to low heavy-element abundances Z pose a severe problem for solar-structure modeling. The low- Z abundances imply a lower opacity and a relatively shallow convective zone, both of which are in obvious contradiction with the observed helioseismic sound-speed profile. This paper presents a series of solar models with different heavy-element abundances. The SAHA-S equation of state and OPAL opacities properly take into account the respective heavy-element abundances. Diffusion of individual elements is also included in the models. Sound-speed profiles are compared with inversion results and it is shown that the models with low Z are in disagreement with the inversion data. Even combining the effect of diffusion, overshooting and mixing for the sound-speed profile did not lead to a solution of the low- Z problem. Models with varied neon abundance have also been computed. It turned out that a substantial increase of the neon abundance could produce a model in agreement with the sound-speed inversion but the required abundance increase would be unrealistic. The effect of the neon enhancement on the adiabatic exponent profile in the convection zone is also presented.

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