Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-06
Astronomy and Astrophysics
Astrophysics
Astron. Astrophys., in the press
Scientific paper
10.1051/0004-6361:200810170
Recent revisions of the determination of the solar composition have resulted in solar models in marked disagreement with helioseismic inferences. The effect of the composition change on the model is largely caused by the change in the opacity. Thus we wish to determine an intrinsic opacity change that would compensate for the revision of the composition. By comparing models computed with the old and revised composition we determine the required opacity change. Models are computed with the opacity thus modified and used as reference in helioseismic inversions to determine the difference between the solar and model sound speed. An opacity increase varying from around 30 per cent near the base of the convection zone to a few percent in the solar core results in a sound-speed profile, with the revised composition, which is essentially indistinguishable from the original solar model. As a function of the logarithm of temperature this is well represented by a simple cubic fit. The physical realism of such a change remains debatable, however.
Christensen-Dalsgaard Jørgen
Di Mauro Maria Pia
Houdek Günter
Pijpers Frank
No associations
LandOfFree
On the opacity change required to compensate for the revised solar composition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the opacity change required to compensate for the revised solar composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the opacity change required to compensate for the revised solar composition will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-631180