[mesa-users] Weird HR diagrams.

[Félix Blais]

Hello, I did put okay_to_reduce_gradT_excess = .true. in the &controls of
inlist_1.0. And i have a result that make me laugh a lot (looks like the
star is dancing). I finally got the termination code : Log_L_lower_limit

stop because log_surface_luminosity <= log_L_lower_limit

First of all. i read what does this line do, but why do i have to put it in
this case and not on the other? Why is this line not included in
1M_pre_ms_to_wd?

Enjoy the video. Would you say it's normal? This is the craziest one i
have, because usually, the stars come back a little on the AGB phase and
goes to WD after. I noticed that this last flash usually occurs with low
metallicity (from my models), but now, at 0.03.... i dont know what to
think.

Thank you

Félix B

2015-11-29 22:36 GMT-05:00 Jared Brooks <brooksjaredc at gmail.com>:

> Hey Felix,
>
> Great video! It looks like your model underwent a pretty sizable last
> flash in the helium layer. I noticed the the test case you are working with
> (1M_pre_ms_to_wd) doesn't use MLT++, so you might want to try that by
> setting okay_to_reduce_gradT_excess = .true. in the controls section.
>
> Hope this helps.
>
> -Jared
>
> On Sun, Nov 29, 2015 at 6:50 PM, Félix Blais <felix.blais.duff at gmail.com>
> wrote:
>
>> Hello, I am using the 1M_pre_ms_to_wd/ to check the evolution of stars
>> depending on their metallicity (z) and Mass (M). I did plenty of
>> simulations, but at 1.6M_z_0.03, I had a result that made no sense to me.
>> There is an attachment of the video.
>>
>> At first, I had this error
>>
>> stopping because of convergence problems dt < min_timestep_limit
>>
>> terminated evolution: convergence problems
>>
>>
>> with :
>>
>>
>> change_lnPgas_flag = .true.
>>
>> new_lnPgas_flag = .true.
>>
>>
>> ! check for retries and backups as part of test_suite
>>
>> ! you can/should delete this for use outside of test_suite
>>
>> ! max_number_backups = 200
>>
>> ! max_number_retries = 500
>>
>>
>> Then i commented change_lnPgas_flag and new_lnPgas_flag, but i got the
>> result shown in the attachment. I had to stop it because the run had 10000
>> models done and the star wouldn't move.
>>
>>
>> What's happening? It doesnt do this with all of my other simulations..
>> (which inculde 1.6M at different metallicity, 1.8,1.4,1.2) Help!
>>
>>
>> Thank you
>>
>>
>> Félix B.
>>
>>
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