[Mesa-users] What does this warning mean?

[Noah Tuchow]

Oh sorry. I forgot to include that. Here is the model file I was loading
from. Some of the file locations are the locations on my machine, so just
change those to whatever works.

I managed to get a simpler model of the star working without diffusion or
changing much from the MESA defaults, but I eventually want to compare the
model's surface Z/X values to those measured for the star, and I think I'd
need to turn diffusion on to accurately reproduce that.

Thanks,
Noah Tuchow
---Noah TuchowPenn State UniversityDepartment of Astronomy and Astrophysics532C
Davey LabUniversity Park, PA 16802


On Thu, Jan 30, 2020 at 5:58 PM Evan Bauer <ebauer at physics.ucsb.edu> wrote:

> Hi Noah,
>
> I think I can help, but I’d like to run your model first to look at it
> firsthand. It looks like your inlist needs a starting model. Can you send
> that?
>
> Cheers,
> Evan
>
>
> On Jan 30, 2020, at 12:56 PM, Noah Tuchow <nxt5109 at psu.edu> wrote:
>
> Hello,
>
> I'm trying to model a 1.36 Msun star, analogous to Theta Cygni, and when I
> try running a model with diffusion and convective overshoot, I get warning
> messages such as the following during its evolution:
>
> exit at x=        0.6168E+15
>   more than nmax =        1000 steps are needed
>
> and also it prompts a retry:
>
> retry because of timestep limit diff steps     100       7     100
>
> This causes MESA to run very slowly, and I'm not sure if I can trust the
> end results. MESA exits prematurely before H depletion or the maximum age,
> because in my run_star_extras I have it exit if the time step becomes too
> small.  What does this exit at x message mean? Which aspect of the code is
> printing it to the screen?
>
> Perhaps this is due to the inlist I am using, which is slightly modified
> from a solar model I was running. Do you know how I can avoid this problem
> in the future, while also including diffusion in my model? This star should
> have a pretty thin outer convective zone, so maybe that is causing a
> problem.
>
> I've attached the inlist I've been using in MESA 11701 and my
> run_star_extras.
>
> Any ideas about how to resolve this problem?
>
> Thanks,
> Noah Tuchow
> ---Noah TuchowPenn State UniversityDepartment of Astronomy and
> Astrophysics532C Davey LabUniversity Park, PA 16802
> <inlist_main><run_star_extras.f>
> _______________________________________________
> mesa-users at lists.mesastar.org
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>
>
>
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