[Mesa-users] A question about ionization energy

[Yamaguchi, Natsuko]

Hello,

I am using MESA to trace internal energy in stars, which by default is defined as the thermal energy + the ionization energy (Paxton et al. 2018).

I would like to trace the two components separately - I understand the thermal energy density is simply 3/2 P/rho which can be integrated over mass to get thermal energy. The ionization energy is then simply this thermal energy subtracted from the total internal energy.

But out of curiosity, how can I trace the ionization energy directly? I'm having a bit of trouble getting consistent values with the above.

Thank you for the help,

Natsuko Yamaguchi

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