[mesa-users] how to make the evolution quickly when using astero_mode

[Bill Paxton]

Hi Kaka,

I'll try to reproduce the problem on my machine -- then perhaps we can find a solution.
To make sure I'm doing the correct thing, please send me your inlist_3 and inlist_astero_search_controls
for the case that gets stuck on the MS.  

Thanks,
Bill




On Jan 8, 2013, at 5:41 PM, Kaka Abel wrote:

> Hi Denis,
> Thank you for your help, and sorry for my incomplete description.
> 
> In my calculation, the change of  the initial_mass(eg: 1.89 to 1.83), can cause a large difference. In the first case, the calculation crossed the MS smoothly(it started at about mode 910 and ended at 1000 in MS), but in the last, it nearly stopped at the MS (I can see it from my pgplot output H-R diagram). Then, it will stay there for a long time, the mode NO.  start at about 900 but end at about 8000+. It's really a long time. And if it crossed the MS, the track would soon evolute into the target area(the target is a post-MS star), and end within about 300~400 modes. (in this stage, the frequencies would be calculated).
> 
> PS: I just modified the default inlist_3 and the inlist_astero_search_controls(mesa/star/astero/) to adopt my condition. In inlist_3, I just modified the initial_mass, initial_z, and creat pre-ms-mode. And of course, some pgstar customization. In 
> inlist_astero_search_controls, i modified the target observed quantities and their sigma(with the frequencies), the   <       
>          first_FeH = -0.25d0
>          first_Y = 0.23d0
>          first_mass = 1.88d0
>          first_alpha = 1.921875d0
>          first_f_ov = 0.015d0
> >
> also changed.
> Except these settings, i  not change other in these two files.
> 
> 
> yours
> Kaka
> 
> 2013/1/9 Dennis Stello <stello at physics.usyd.edu.au>
> Hi Kaka,
> 
> The echelle diagram of your pgplot output should tell you if the slow down is when frequencies are calculated, which I suspect it is.
> 
> PS: have a look at the description in the MESA paper II that was posted on astroph and announced on this mailing list last week.
> 
> Cheers
> Dennis/
> 
> 
> On Tue, 8 Jan 2013, Kaka Abel wrote:
> 
> Hi:
> everyone.
> Recently, i use mesa_astro to calculate the mode which can be accord with
> the observed result.
> (my mesa version NO. is 4740.)
> In some cases, the evolution procession carried out quickly and smoothly,
> but in some cases, when the evolution track reached the MS, the rate of
> evolution decreasing abruptly, i need about nearly 1~2 hours  to wait it
> over.
> I don't know why this happened. Is this the reason of the customization of
> timesteps? If it is so, why in some cases, it can get across the MS
> smoothly.
> Thank you~~~
> 
> 
> yours Kaka
> 
> 
> -- 
> Dennis Stello
> 
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