[mesa-users] issue with OP AGSS09

[Jakub Ostrowski]

Hi,

I'd like to point out an unusual behavior that happens with calculations which use the recently implemented OP AGSS09 opacity tables. I calculated models within mass range of 3 - 20 MS and for metallicity between 0.01 and 0.02 and there are problems with every model.

First of all, with OPAL AGSS09, OPAL GS98 and OP GS98 there is a helium blue loop for every calculated track while for OP AGSS09 there is none for any of them. This behavior itself doesn't necessary mean that something is wrong, but the other thing does: after the core helium abundance drops below about 1% it suddenly rises to about 3% and the energy produce from helium burning increases. Then it repeats itself again for a dozen of times or so. I attached a plot that shows this behavior for 15Ms and Z = 0.01, but this problem exists for every single model I calculated with OP AGSS09.

I discussed the problem with Radek who provided the tables. He confirmed that the problem is real and I'm sure he will soon provide his ideas.

My environment: MESA v5456 compiled with SDK on OS X 10.8.5. You can find the attaches inlist. The only things I changed there are opacity tables, mass and metallicity. 

Cheers,
Jakub

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