[mesa-users] 1Msun: Sudden jump in the HRD

Bill Paxton paxton at kitp.ucsb.edu
Mon Jan 12 16:32:04 EST 2015


On Jan 12, 2015, at 9:02 AM, Matteo Cantiello wrote:

> Hi Bill ,
> 1Msun climbing the giant branch (very early on).
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> It seems connected to a sudden changein H/He enve


Hi Matteo/Diego/Dennis,


I've recreated the jump with the current version.

As you note, the HR jump goes with a jump in He surface abundance fro 0.29 to 0.325.
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base of convection zone
model 2767 (good)
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model 2768 (bad)
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Turns out that the tiny extra convection zone at the base of the "real" convection zone in model 2768 is the source of the problem.
It triggers a bug in the smoothing of newly non-convective regions.  
I've fixed the bug and will make a new release asap.
Meantime you can workaround this by setting smooth_convective_bdy = .false.
Or get 7383 with the understanding that it hasn't been run on the entire test suite yet.


-B



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