[Mesa-users] Theoretical question about ionization

[Jaime Montes Norniella]

The MESA profiles frequently show an ionization gap in between the nucleus and the atmosphere, but much more near the nucleus.
I think that this gap is because de lack of pressure ionization once the pressure decays away of the nucleus.
Ionization returns to be complete farther away supposedly by the major effect of temperature which decays slowly.
My question is: How MESA implements pressure ionization, knowing that no perfect theory is at hand (Kippenhahn, Stellar Structure, page 138)?

All your ideas are welcome.

Thanks.

Jaime Montes.
University of Salamanca, Spain.
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