[Mesa-users] Standard Solar Model initialization

[Aaron Dotter]

Hi Noah,



 but find that both my model and the test_suite example don't appear to be
> initialized from the premain sequence and instead load a model from the
> file 'solar_calibration_input.mod'. I'd like to know how exactly this model
> file was made and with what inlist
>

solar_calibration_input.mod was made using a previous version of the inlist
used in the solar calibration test suite case you're running.  Also a
previous version of MESA and (likely pre-MESA SDK) compiler.  If you look
at the contents of the file, you'll see the creation date is 20100823 so
it's 8 years old.

I'm a bit confused as to what exactly the model I'm loading is, because
> some of the arguments used in the solar calibration inlist in the example
> appear to be for initializing a premain sequence model with from a cloud
> with uniform composition, specified mass fractions and abundances.
>

The purpose of using such a model is to skip over the first 370 timesteps
(model number is 371) of pre-main sequence contraction and the construction
of the pre-main sequence structure.  This saves a fair amount of time
without causing egregious errors in the results.


> I've noticed that MESA crashes if I keep all the inlist arguments the same
> values and just start with set_uniform_initial_composition = .true. without
> loading the model, and I think that this is likely due to
> having which_atm_option = 'photosphere_tables'.
>

What do you mean by "MESA crashes"?  What does the terminal output say?  If
you try to run the solar calibration inlist without loading a model AND
without setting create_pre_main_sequence_model = .true., MESA will try to
load a ZAMS model but it's unlikely to have one with your specific
composition.  It's unlikely that this has anything to do with
photosphere_tables for the atm.



> Since this example doesn't appear to have any documentation, I'm curious
> to know how this model file was made and what I should do to initialize a
> model for a slightly different sun.  Does anyone have the inlists used to
> make the model file?
>

See my first response above.  It's possible that the model could be
recreated with MESA circa mid-2010 but I don't think it's worth the
trouble.

Aaron
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