[Mesa-users] Trying to add new output data

[Lynn Buchele]

Dear Ishaan,
The errors you get are because MESA doesn't have routines set up to save the parameters you name. In fact, I don't even see those on the list of variables stored by MESA out-of-the-box (these are listed in the various files in $MESA_DIR/star_data/public). Are you perhaps using a MESA work directory created by someone else which uses these parameters? If so, then you will have to follow the method described on the page you linked to add them to your output.

The global parameters (variables which have one single value at a given time step) can be saved as extra history columns. Parameters that have a value at each point within the star at each time step, can be saved as extra profile columns.

Best,
Lynn

(Re-sent to include the mailing list in cc)




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From: Mesa-users <mesa-users-bounces at lists.mesastar.org> on behalf of Varshney, Ishaan via Mesa-users <mesa-users at lists.mesastar.org>
Sent: Tuesday, April 7, 2026 8:53:56 AM
To: mesa-users at lists.mesastar.org
Subject: [Mesa-users] Trying to add new output data

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Dear MESA users,


I am trying to output a couple of parameters (accel_div_grav, extra_dPdm) by uncommenting it from the profile_columns.list file but it is showing this error when I am trying to run it:


failed to recognize item for profile columns: accel_div_grav

failed to recognize item for profile columns: extra_dPdm

I have tried the method mentioned on https://docs.mesastar.org/en/25.12.1/using_mesa/extending_mesa.html  under "Adding History & Profile Output”. I’m not sure but I think it works for global parameters and not for the large set of properties for each point in the model of the star. I have tried this on two versions of MESA: r23.05.1 and r24.03.1

Could anyone please advise on how to resolve this issue.

Thank you,
Ishaan
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