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Abstract: Recent revisions of the determination of the solar composition have resultedin solar models in marked disagreement with helioseismic inferences. The effectof the composition change on the model is largely caused by the change in theopacity. Thus we wish to determine an intrinsic opacity change that wouldcompensate for the revision of the composition. By comparing models computedwith the old and revised composition we determine the required opacity change.Models are computed with the opacity thus modified and used as reference inhelioseismic inversions to determine the difference between the solar and modelsound speed. An opacity increase varying from around 30 per cent near the baseof the convection zone to a few percent in the solar core results in asound-speed profile, with the revised composition, which is essentiallyindistinguishable from the original solar model. As a function of the logarithmof temperature this is well represented by a simple cubic fit. The physicalrealism of such a change remains debatable, however.



Autor: Jørgen Christensen-Dalsgaard, Maria Pia Di Mauro, Günter Houdek, Frank Pijpers

Fuente: https://arxiv.org/



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