[Mesa-users] Problems with the timestep in the binary module.

Hades ... vegaluap at hotmail.com
Fri Oct 9 11:56:41 EDT 2020

Greetings to the MESA community.

I am working with the Mesa binary module, I try to generate a set of models for stars in a range of 3 to 4 solar masses, and periods close to 4 days, in the model I add parameters that define the behavior of each layer of the primary star, also other parameters that control a magnetic dynamo in the stars, I attach a compressed file with all used inlist files.
The model should stop when either of these two parameters is met xa_central_lower_limit_species (1) = 'he4', max_age = 3.817017d8. But the model stops long before these conditions are met, the cause that stops the model is an error associated with the value of dt, when the binary system is reaching the end of its mass transfer stage, the dt becomes very small , the dt becomes below the limit defined by min_timestep_limit, try to set that limit with very small values, but still the dt reaches those small values ​​very quickly. I still do not manage well in the use of Mesa, and I do not know if I am making an error in the definition of some physical parameter that affects the values ​​of the dt, I also attach an image with the final message that appears in the terminal.
I appreciate your help.

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