[Mesa-users] Request for helping solve MESA run star extras problem

[Sayed Shafaat Mahmud '26]

Hello,

I'm Shafaat, an Astrophysics research assistant studying at Colgate
University. I have been trying to get used to using MESA for the past month
and right now, I'm at a stage where I am trying to add an additional
heating source to my star and run stellar models.

I tried my first try from one of your GitHub guideline templates for MESA
summer school 2021: https://jschwab.github.io/mesa-2021/

Specifically, I was trying to solve part 3b where we try to change the
input physics of our MESA simulation. For clarity, I looked up the
solutions and quite literally followed every step to solve the problem.
However, MESA throws out an error saying it cannot convert real(8) to
TYPE(auto_deff_real_star_1) for s% extra_heat (Please refer to the figure
showing the terminal snapshot). I understand the step requires
differentials and that's exactly why I added s% dm. However, the error
still persists. Is there a workaround for this? If so, what else can be
done? (I made sure I added the *use_other_energy = .true. *command in the
controls inlist and also added the s% other energy in my extras control
routine.

Thank you!

Regards,
Shafaat
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