[Mesa-users] Doubt about change in the condition to apply magnetic braking

[Evan Bauer]

Hi Diogo,

It looks like this change was motivated by this mesa-users post from Kareem El-Badry in 2020:
https://lists.mesastar.org/pipermail/mesa-users/2020-August/011805.html <https://lists.mesastar.org/pipermail/mesa-users/2020-August/011805.html>

Pablo updated the logic for when magnetic braking applies shortly after that, just before MESA release version 15140.

Cheers,
Evan


> On Jul 25, 2023, at 9:15 AM, Diogo Belloni via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Dear all,
> 
> I have been currently working with MESA version 15140 but I used in
> the past the version 10108 and I was wondering about the change in the
> condition to apply magnetic braking.
> 
> In version 15140 (and also in most recent versions), the condition
> depends on two mass fractions
> 
> jdot_mb_max_qconv_env = 0.99d0
> jdot_mb_max_qrad_core = 1d-2 (latest version: jdot_mb_max_qconv_core = 1d-2)
> 
> In version 10108, if I understood correctly, this was not controlled
> by controls and the assumed limiting fractions were 0.75 and 0.25, for
> the envelope and the core, respectively (in subroutine
> check_radiative_core).
> 
> I wonder if you could please kindly let me know the motivation for
> such a change in the default values of the condition to apply magnetic
> braking.
> 
> I greatly appreciate your help in understanding this.
> 
> Many thanks in advance,
> Diogo
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
> 

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