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

[Kaka Abel]

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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