[Mesa-users] Test Suite: 1M_pre_ms_to_wd

[Aaron Dotter]

Hi Erica,

With a max_years_for_timestep = 1d5 and max_model_number = 6500 your
simulation will end with an age of ~650 Myr.

That does *not* mean it has reached any specific evolutionary point, just
that it has reached the max_model_number and that is one criterion for MESA
to terminate the evolution.

A 1 Msun model (at solar Z) should have a main sequence lifetime of ~10 Gyr
so you would need about 10^5 timesteps to reach the end of the main
sequence with a max_years_for_timestep = 1d5.

Aaron

On Thu, Nov 18, 2021 at 3:24 PM Erica A Sawczynec <ericasaw at utexas.edu>
wrote:

> Hi Aaron,
> Will this cause the star to evolve to the MS turn-off in 6500 steps
> regardless of if it should be there or not? I tried changing this value to
> be bigger and ran into the same issue. Here is a plot I made using TULIPS
> of the radius as a function of time. You can see the star is at the MS
> turn-off at 638 Myr. Trying a run with turning that off now!
> Thanks,
> Erica
>
>
> On Nov 18, 2021, at 2:17 PM, Aaron Dotter <aaron.dotter at gmail.com> wrote:
>
> Hi Erica,
>
> You have max_model_number = 6500 in the inlist.  Try removing this from
> the inlist (or set to -1).
>
> Aaron
>
> On Thu, Nov 18, 2021 at 3:08 PM Erica A Sawczynec <ericasaw at utexas.edu>
> wrote:
>
>> Hi All!
>> I have been tinkering with the 1M_pre_ms_to_wd test suite to try to look
>> at the depth of the convection zone boundary as a function of opacity. I
>> have an altered version that no longer uses the to_end_wd inlist and I set
>> the envelope mass limit so the to_end_agb inlist doesn’t actually go too
>> far past the MS turn-off. I want to finely sample the  MS so I tried
>> turning on the max_years_for_timestep keyword in the debugging section. I
>> set it to something small like 1d5, which feels reasonable for the MS, but
>> I’ve noticed whenever I do this, the test suite evolves a 1M_sol star to
>> the end of the MS in ~600 Myr (which isn’t possible).
>> I thought that the max_years_for_timestep would keep the time to evolve
>> to the MS turn-off the same, but increase the sampling of the MS, is that
>> not the case? I even tried increasing the mass model number (up to 65000),
>> thinking maybe that imposed some sort of restriction on the model, but even
>> then the age of the star at the end of the run is way too young. I’ve
>> attached my changed inlist below, note that it will “fail” with the "failed
>> to create end_agb.mod when running inlist_to_end_agb_header” error, but
>> there is still a history.data file where you can look at the results of the
>> run.
>> I cannot help but feeling I am missing something silly here, but I just
>> can’t figure out what it is. Any help is greatly appreciated!
>> Thanks,
>> Erica
>>
>> _______________________________________________
>> mesa-users at lists.mesastar.org
>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>
>>
>
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