[mesa-users] Converging an AGSS05 Solar model

Robert Farmer rjfarmer at asu.edu
Tue Aug 9 18:56:15 EDT 2016


>initial_h1 =.0.6805
Hopefully that is just a typo in the file you sent but it should be: (you
have an extra .)
initial_h1 =0.6805

>Still, I can't get the correct surface abundances of 0.0165=z/x along with
L =1 and R=1.

How close do you get? Also what happens if you run from the pre-MS with
your chosen composition? In star_job set:

create_pre_main_sequence_model = .true.

You might want to look at and run the solar_calibration (takes a while to
run) with your choice of AGS05. This tries to make the "best" solar model
by tweaking the inputs, look for its vary_ options in
inlist_astero_search_controls and matching the model to the solar data.


On Tue, Aug 9, 2016 at 8:32 AM, Farag, Ebraheem Khaled <farag.11 at lanl.gov>

> Hello all,
>     I'm attempting to converge an AGS05 model of the sun using the
> example_solar_model in the test_suite. This has worked for all other
> Opacities and abundances including AGSS09, GS_98, and GN_93. My current
> problem is that I can't seem to converge the model for the AGS05 opacities
> and abundances.
>     I have set:
>       z_frac = 5(Ags05 z fracs)
>       kappa_file_prefix = 'a05+Ne'
>       kappa_lowT_prefix = 'lowT_fa05_ags04' ! for lower temperatures.
> ------------------------
> Still, I can't get the correct surface abundances of 0.0165=z/x along with
> L =1 and R=1. The one time I got very close, the sound speeds looked
> nothing like I believe they should(sound_standard.png).
> ****Typically, after changing the Z-fracs and kappa files, I adjust the
> initial H1 and He4 along with he mixing length alpha to converge the
> model.***
> Any tips?
> Thanks,
> Ebraheem
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