[Mesa-users] mesa r10398, suite-case make_co_wd, question about inlist

[Francis Timmes]

hi alex,

to perhaps help move you along ...

attached is a mesa work directory that evolves a 2.1 msun model from the pre-ms to a wd. 
this is from one of my ongoing active science projects, which saw its opening salvo in https://ui.adsabs.harvard.edu/#abs/2018ApJ...867L..30T/abstract . i also used a variation 
of this work directory in the 2018 mesa summer school (http://cococubed.asu.edu/mesa_market/education.html).

the inlist_project uses the new convective pre-mixing described in the mesa V instrument paper,
https://ui.adsabs.harvard.edu/?#abs/2019arXiv190301426P/abstract , and the model results will 
probably get very close to the evolutionary track shown in figure 1.

fxt





> On Mar 6, 2019, at 12:39 AM, Francis Timmes <fxt44 at mac.com> wrote:
> 
> i'll assume the goal is go from the pre-ms to a wd with a specified luminosity.
> 
> from the hr diagrams and inlists it appears, in my experience, that the mass resolution 
> and timestep are too coarse to gracefully get through the thermal pulses. if so, there are 
> several ways to increase the mass resolution and decrease the timestep, with 
> mesh_delta_coeff and varcontrol_target being a starting point.
> 
> the purple curve in figure 1 of the new mesa instrument paper (https://arxiv.org/abs/1903.01426)
> shows such an evolution is achievable. 
> 
> fxt
> 
> 
> 
> 
> 
> 
>> On Mar 2, 2019, at 8:04 AM, Александр Сергеевич Андрюшин <andriushin.as14 at physics.msu.ru> wrote:
>> 
>> Hello everyone!
>> I'm back with almost the same topic of experimenting with make_co_wd (and i'm still ). Again with initial mass 5 solar masses, the following two inlists (see attachment). With inlist_prepare_to_make_co_wd MESA is reaching lg (L/Lsolar) ~ 4.25 and lg Teff ~ 4.5, where the programm goes on a loop, then breaks it and starts inlist_make_co_wd (see attachments of HR diagram). Having reached lg (L/Lsolar) ~ 4.15-4.2 and lg Teff ~ 5.1 MESA goes on another loop and there reaches maximum model number (7000 in this case). I've managed to overcome the problem restarting from model number ~1000 or so, then MESA reached log_L_lower_limit = -2 (that was what i needed). But i m not sure it's the right way. Maybe i should better change something in inlists?
>> 
>> Another question is connected with the first one. While changing from inlist_prepare_to_make_co_wd  to _inlist_makecowd MESA kills the history file and creates new one. I need to save history of red giant phase too. When i tried the same suite case with initial mass 3 solar masses and there was no such a problem - history file contained all stages of evolution (from MS) after the final model was created. Could you give an advice how to solve this problem? (I suppose it is not the problem of programming only but also the question of physics and inlist parameters as mass loss and others )
>> 
>> пн, 31 дек. 2018 г. в 02:53, Александр Сергеевич Андрюшин <andriushin.as14 at physics.msu.ru>:
>> Thank you very much! 
>> 
>> пн, 31 дек. 2018 г. в 02:08, Francis Timmes <fxt44 at mac.com>:
>> hi alex,
>> 
>> i’ll paraphrase jared’s reply in
>> https://lists.mesastar.org/pipermail/mesa-users/2018-December/009681.html
>> 
>> the two inlists are executed in succession, see the “rn” file.
>> 
>> whenever a saved model is loaded (i.e., load_saved_model = .true., 
>> saved_model_name = '<some name>.mod'), mesa ignores the control initial_mass. 
>> 
>> in your specific case, an initial mass of 3.25mun is set in 
>> inlist_prepare_to_make_co_wd and the ending model is saved as after_1st_TP.mod. 
>> 
>> inlist_make_co_wd is then run and it loads after_1st_TP.mod. this picks up the 
>> correct mass to continue the run (including any changes in the mass resulting
>> from inlist_prepare_to_make_co_wd). the initial_mass setting in inlist_make_co_wd is ignored.
>> 
>> clearer?
>> 
>> for aesthetic purposes only, one could set initial_mass to be the same in both inlists.
>> 
>> fxt
>> 
>> 
>> 
>> 
>> 
>> 
>>> On Dec 30, 2018, at 11:33 AM, Александр Сергеевич Андрюшин <andriushin.as14 at physics.msu.ru> wrote:
>>> 
>>> Hello!
>>> My name Alex!
>>> I'm exploring MESA suite-case make_co_wd. Here https://arxiv.org/pdf/1301.0319.pdf i have read about the suite case. So i have found two inlists inlist_prepare_to_make_co_wd  and inlist_make_co_wd. My question is why the initial mass in inlist_make_co_wd (6 solar masses) is bigger then in inlist_prepare_to_make_co_wd (3.25 solar masses )? 
>>> 
>>> For instance, i need to make CO white dwarf for a star with ZAMS_mass about 5 solar masses. Should i write down the same initial masses in both mentioned inlists?
>>> _______________________________________________
>>> mesa-users at lists.mesastar.org
>>> https://lists.mesastar.org/mailman/listinfo/mesa-users




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