[Mesa-users] The evolution after log T_c > 9.85 for presupernova

[Rob Farmer]

Hi,

>  With nuclear burning, why "inlist_finish" and "inlist_to_lgT_9.9" show
such large differences?

Look for the other differences between the inlists. These are not solving
the same structure equations

>How the following evolution is treated differently in "inlist_finish"?

inlist_finish is preparing the model to be exploded. By turning off the
nuclear burning the star will more easily collapse, making it computational
quicker.

 >  All these three lines seems strange, so how we treat the evolution
before pre-SN in MESA.

These are test cases, we use them to make sure MESA is working and to
demonstrate what MESA can do. However it is up to the user to determine
whether the model matches reality and to do tests like you have done to see
what happens when inlist options are altered. The test suite options are
not optimally chosen for any model and need modification by the user before
use.

You could just use a newer version of MESA that can better handle
pre-supernovae evolution. MESA r22.05.1 test case
20MS_pre_ms_to_core_collapse gets to core collapse without needing to turn
off the nuclear burning.

Rob


On Tue, 4 Oct 2022 at 12:49, 辛文宇 via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi,
>
>
> I've calculated the evolution of presupernova from ZAMS with mesa-r12778.
>
> The calculation with  "inlist_to_lgT_9.9" stop at log T_c = 9.85, then
> "inlist_finish"
>
> is used for the folowing evolution. The evolution in T-Rho diagram
> (final_trho.pdf)
>
> is the black line.
>
> I noticed that these two:
>
> eps_nuc_factor = 0d0
>
> dxdt_nuc_factor = 0d0
>
> are used in inlist_finish. The nuclear burning is turn off artificially.
> Thus I uncomment
>
> those and trun on the nuclear burning. The evolution becomes the green
> line in final_trho.pdf.
>
> It seems strange. I also try to remove the "inlist_finish" and continue
> the following evolution
>
> with "inlist_to_lgT_9.9", which is red line in the final_trho.pdf.
>
> The Kippenhahn diagram of green and  red line are also attached.
>
> Here are questions.
>
> With nuclear burning, why "inlist_finish" and "inlist_to_lgT_9.9" show
> such large differences?
>
> How the following evolution is treated differently in "inlist_finish"?
>
> All these three lines seems strange, so how we treat the evolution before
> pre-SN in MESA.
>
>
> Thanks,
>
> Wenyu
>
>
>
>
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20221004/f5b0482c/attachment.htm>