[Mesa-users] Model a star in the HR diagram

[Aaron Dotter]

Hi Gonçalo,

You haven't said which MESA version you're using; that will influence the
answers you get to your questions.

To your second question, search the astero / simplex controls file for
controls related to chi2_*_limit (or if a recent version just chi2_limit).
These are typically set to 1000 but you can make them much larger.  The
code reports that it can't find a chi^2 for a given model if the total, or
any individual term, exceeds these limits.  Also look for controls called
sigmas_coeff_* and try setting these to zero.

Aaron



On Mon, Apr 9, 2018 at 10:06 AM, Gonçalo Andrade via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Dear all,
>
>
>
> I am currently using MESA and I need to make a model of a star as close as
> possible to a given T_eff and log(L).
>
>
> Up to this moment I have been trying to use the solar_calibration example
> in the test_suite and the example in the Astero folder that is available
> inside the star directory, but I have encountered two main problems:
>
>
> 1) I have tried to remove the oscillation computation, since I don't need
> it and it consumes time, by removing all the frequencies in the file
> "inlist_astero_search_controls" and by commenting the &mode sections in
> the gyre.in file but, once the models get close to the expected, it
> begins calculating the frequencies anyway.
>
>
> 2) Ignoring the frequencies problem, I have managed to make small physics
> changes I needed and the calibration by simplex still functions perfectly
> fine. However, the moment I change the target T_eff and log(L) and the
> starting mass, alpha, etc, the code runs but always says it could not find
> chi^2 in that run, and does not present the results in the output file.
>
> I have even tried doing a single run with a given mass, alpha, etc, and
> copying the resulting parameters to the target in the
> "inlist_astero_search_controls" and I still get the same result.
>
>
> Are there any useful commands I might be missing?
>
> If needed I can attach the inlists I am using.
>
>
>
> I grateful for any help you could give.
>
>
> Best regards,
>
> Gonçalo Andrade
>
>
>
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
>
>
>
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