[Mesa-users] A question about delta_HR_limit

[Levi]

Dear Mesa users,


I had a very confusing experience when using MESA version r10398.
I was recently working on a set of models that went from zero age main sequence to core collapse, and in the process of this, I suddenly found that the delta_HR_limit option would greatly change the nature of the model. At the beginning I set a=b, the delta_HR_limit = 0.005d0 then the evolution trajectory moves towards the RSG of the 23Msun in the figure below, then I comment out it in the inlist, and the evolution trajectory moves towards the BSG such as 20Msun test. In addition, the helium core mass of the two models at the time of pre-collapse are 13.7 and 20.2 Msun, respectively.
I considered the initial surface speed of 600 km/s and the magnetic braking in the model but I don't know why the delta_HR_limit option would make such a big difference. 
I was very grateful for any information.


Thanks,
Levi
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