[Mesa-users] What does this warning mean?

[Evan Bauer]

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 Tuchow
> Penn State University
> Department of Astronomy and Astrophysics
> 532C Davey Lab
> University Park, PA 16802
> <inlist_main><run_star_extras.f>_______________________________________________
> mesa-users at lists.mesastar.org
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> 

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