[Mesa-users] Use of OPAL table with specific chemical composition

[mutlu yildiz]

Dear Ebraheem,

Thank you very much.

Best wishes,
Mutlu

On Mon, Jul 14, 2025 at 3:17 PM Farag, Ebraheem <ebraheem.farag at yale.edu>
wrote:

> Hello,
>
> The OPAL opacity tables are run through preprocessing routines which
> spline and smooth them. If your OPAL tables are not already splined, you'll
> need to look into the $MESA_DIR/kap/preprocessor scripts and determine how
> to run them on your opacities.
>
> If your tables have already been run through the smoothing spline
> routines, or if you just want to use the raw tables, just paste them
> directly into $MESA_DIR/data/kap_data/.
>
> On using custom user tables:
>
> If you are generating the standard 126 opal tables in an identical format
> and grid size. Something like the following should work in your kap inlist:
>
>       kap_file_prefix = 'Custom_OPAL_tables' # example prefix for your
> tables
>
>       user_num_kap_Xs = 10
>       user_kap_Xs
> =0.0d0,0.1d0,0.2d0,0.35d0,0.5d0,0.7d0,0.8d0,0.9d0,0.95d0,1.0d0
>
>       user_num_kap_Zs = 13
>       user_kap_Zs =  0.0d0, 0.0001d0, 0.0003d0, 0.001d0, 0.002d0, 0.004d0,
> 0.01d0, 0.02d0, 0.03d0, 0.04d0, 0.06d0, 0.08d0, 0.1d0
>
>       user_num_kap_Xs_for_this_Z = 10,10,10,10,10,10,10,10,10,10,9,9,8
>
> # Note, you might want to double check these by following the instructions
> here https://docs.mesastar.org/en/latest/kap/defaults.html#custom-tables for
> more details.
>
> It is additionally recommended that one test their opacity tables, by
> using the $MESA_DIR/kap/plotter functionality, before incorporating them
> into a stellar model.
>
> -EbF
>
> ------------------------------
> *From:* Mesa-users <mesa-users-bounces at lists.mesastar.org> on behalf of
> mutlu yildiz via Mesa-users <mesa-users at lists.mesastar.org>
> *Sent:* Monday, July 14, 2025 3:22 AM
> *To:* mesa-users <mesa-users at lists.mesastar.org>
> *Subject:* [Mesa-users] Use of OPAL table with specific chemical
> composition
>
> Dear MESA Users,
>
> I want to use the opacity table I calculated for a specific chemical
> composition on the OPAL website instead of the opacity options available in
> MESA.
> Thank you in advance for your help on this matter.
>
> Cheers,
> Mutlu
>
> --
> Ege Üniversitesi Fen Fakültesi
> Astronomi UBB 35100 Bornova İzmir
> https://orcid.org/0000-0002-7772-7641
>


-- 
Ege Üniversitesi Fen Fakültesi
Astronomi UBB 35100 Bornova İzmir
https://orcid.org/0000-0002-7772-7641
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