[Mesa-users] Issue with rotation in MESA r22.11.1

[Torres, Guillermo]

All,

I am using MESA r22.11.1 to model the evolution of a rapidly rotating star
of 5.04 solar masses (initial w/w_crit = 0.55), and I'm finding an odd
shape for the evolutionary track in the blue hook region, as the star is
contracting. During this phase, I see the model reaching very high values
of w/w_crit up to the limit of 0.99, and as it approaches that value, the
morphology goes haywire, at least compared to a similar track from the
PARSEC v2.0 series (see figure attached, with the odd part highlighted in
red). I'm wondering if this really is an issue with the physics in MESA, or
just that I don't have the right controls in my inlist. It appears the star
would need to get rid of more of its angular momentum to avoid this, but
evidently it is not doing that with the controls I am using. I attach my
inlist for reference. The pre-main-sequence part is computed separately. I
would be thankful for any suggestions.

Willie
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