[mesa-users] Problems with Rochelobe overflow

[Robert Farmer]

What happens to the timestep if you run your primary star inlist as a
single star? Post carbon burning can be difficult without the added
complications of mass transfer.

Also in your terminal output what's limiting the timestep? This will give
you a clue as to what to change to get bigger timestep. Your looking for
dt_limit in the output. Then search the binary and single star
control.defaults file to match that limit to a inlist parameter.

Rob
Dear all,
for my masterthesis I am using MESA to evolve binary systems in search for
electron capture supernovae in binary systems. However, I am experiencing
some troubles with the Rochelobe overflow, especially later in the
evolution. This limits my ability to predict if a star will become a
supernova or not since this depends a lot on the final mass of the star. If
there is a phase of Rochelobe overflow at the end of the run and this
removes enough mass, the supernova can be prohibited.
The problem is that at the end of the simulation run, after carbon-burning,
the timesteps become very small, as in seconds, and it seems that the code
is a bit stuck. When checking the radius and radius of the Rochelobe, this
seems to be the same moment as a second phase of Rochelobe overflow begins.
Is there a way to get the binary system through this second Rochelobe
overflow more smoothly?
I have attached the inlist-files I am using. I use MESA-version 8118.
With kind regards,
Hannah Brinkman

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