[Mesa-users] do_element_diffusion = .false. != diffusion_class_factor(:) = 0

[Earl Bellinger]

Dear mesa-users,

I am wondering if someone can help me to understand why turning off
element diffusion yields a different result than setting the diffusion
factor to 0? I would expect, perhaps naively, for them to yield the
same result.

Some simple inlists are attached for calculating the first Gyr of
evolution for a solar mass track. There's a small difference in
several quantities, for example the effective temperature changes from
5643.763 to 5643.913. This is somewhat different from running it with
diffusion class factor of 1, which gives Teff of 5643.915.

Best regards,
Earl Bellinger

---
earlbellinger.github.io
Earl Bellinger, Ph.D. Candidate
Stellar Ages & Galactic Evolution Group
Max Planck Institute for Solar System Research
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