[Mesa-users] Stop at RGB tip

[Iñigo Muñoz Elorza]

Hi Pavel, Chris, all

Related to Adrian's question about stopping the model after the RGB tip, I
would like to know if it is possible to impose a control option that works
with ratios instead of the total power as suggested by Pavel, like


*stop when ratio between energy from triple alpha and the one from H fusion
in the shell = 100.*
According to the documentation all the stop conditions seem to be single
conditions, but I wonder if this kind of ratios/calculations could be
defined.

Many thanks in advance for the support.

Cheers,
Iñigo

El mar., 20 nov. 2018 a las 2:21, Chris Mankovich via Mesa-users (<
mesa-users at lists.mesastar.org>) escribió:

> Hi Adrian,
>
> I'd second Pavel's suggestion, and add the comment that a drop in central
> helium abundance might not coincide with the RGB tip for all masses and
> compositions. For instance, a model that will undergo helium core flashes
> will reach the RGB tip well before helium burning reaches the core, at
> least in terms of execution time.
>
> Chris
>
> On Mon, Nov 19, 2018 at 5:08 PM Pavel Denisenkov via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
>
>> Hi Adrian,
>>
>> you can use the following control option:
>>
>>   ! stop when total power from reactions burning helium (in Lsun units)
>> is > this.
>>     power_he_burn_upper_limit = 1d3
>>
>> Pavel
>>
>> On Nov 19, 2018, at 16:06, Adrian Ayala <aayala at ugr.es> wrote:
>>
>> Dear all,
>>
>> I would like to stop some models just after the RGB tip but I didn't
>> found this in the standard stop conditions, in the code documentation.
>>
>> I wonder if were it a good criterion to stop the simulation when central
>> helium mass fraction falls a bit (the starting of He burning). What do you
>> think?
>>
>> Thanks so much in advance!
>> Best wishes,
>>
>> Adrián
>>
>> --
>> Adrian Ayala
>> ---------------------
>> PhD in Space Science and Astrophysics
>> Dep of Theoretical Physics and Astrophysics
>> University of Granada
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>
> --
> Christopher R. Mankovich
> PhD Candidate, Astronomy & Astrophysics
> University of California Santa Cruz
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