[mesa-users] Core hydrogen mass fraction increases in early evolution of 1.5 Msun star

[Richard Townsend]

Hi folks --

I'm running a vanilla MESA (4740) calculation for a 1.5 Msun star, from MS to He flash. Surprisingly (to me), the core hydrogen mass fraction *rises* slightly during the early evolution (~timestep 170). Can anyone explain why this might be so? I attach the inlist.

cheers,

Rich

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