[mesa-users] He-flash problem

[Ehsan Moravveji]

Jakub,
It is very interesting that you are following TP-AGBs. If you trace your
stars approximately below Teff ~~ 3200 K, you will have serious
difficulties with very small time steps of, say, the order lg_dt_yr = -5.0
So, you need practice extra patience again! Sometimes a track takes a day
to finish.
So, you may need to set a lower Teff limit for your runs.

I know that Bill and Falk are seriously working on it.

Best.
Ehsan.

> 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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