[mesa-users] He-flash problem

[Jakub Ostrowski]

Hi Josiah,

It sounds like a good explanation. My goal is to use MESA to study massive stars, but I feel that helium flash is really a good test of the code. Now I'm trying to model thermal pulses and I hope I'll succeed.

Thank you for your your help and take care,
Jakub


On 14 gru 2012, at 22:02, Josiah Schwab <jwschwab at berkeley.edu> wrote:

> Hi Jakub,
> 
> The 1Msun movie that I made on the MESA main page was produced with r3723.  Since we're nearly 1000(!) revisions later, perhaps it's not surprising that things have changed a bit.  In the 4400s (April), I believe Bill increased the default spatial resolution, which would seems like a prime candidate for the increased number of steps to He flash that you observe.
> 
> Josiah
> 
> On Dec 14, 2012, at 6:39 AM, Jakub Ostrowski wrote:
> 
>> Hi!
>> 
>> Ehsan, thank you for your advice, being patient solved the problem. I got helium flash around model 18000 (~3 hours of calculations) but I'm a little bit surprised that it was so late.
>> 
>> Cheers,
>> Jakub
>> 
>> On 13 gru 2012, at 15:29, Ehsan Moravveji <moravveji at iasbs.ac.ir> wrote:
>> 
>>> Hello Jakub,
>>> As a first attempt, try to be more patient, and let the model number pass
>>> nearly 14,000. In my case, I have it around there.
>>> 
>>> Let us know how it goes.
>>> Ehsan.
>>> 
>>>> Hi!
>>>> 
>>>> I'm a new user of MESA and I'm currently trying to learn how to use the
>>>> code. It's totally awesome :) However I found a problem with helium flash.
>>>> I try to calculate evolution of 1.0 M_S star and it doesn't want to start
>>>> helium burning.
>>>> 
>>>> I tried many inlists with different parameters but nothing helps. I'm
>>>> especially bothered because even the unmodified be me inlist from test
>>>> '1M_pre_ms_to_wd' doesn't work. I calculated up to 10500 models and then
>>>> forced stop. In awesome video '1M summary', which is available on the main
>>>> page of MESA, there is a helium flash around model 4500.
>>>> 
>>>> I don't have problem with helium burning in massive models without
>>>> He-flash. I tested eg. 7 or 20 solar masses.
>>>> 
>>>> I use OS X 10.8.2, MESA 4631 and the latest version of SDK. Because I'm
>>>> really a beginning user I don't know which other information I should
>>>> provide you in order to solve this problem.
>>>> 
>>>> I would be grateful for any kind of help.
>>>> 
>>>> Cheers,
>>>> Jakub
>>>> 
>>>> PS. Is it possible to use with PGSTAR the same format of output during
>>>> calculations of evolution like in the mentioned video? I think it has
>>>> perfect size and optimal set of parameters just to follow what the code is
>>>> doing.
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