[mesa-users] The Cepheid phase

[Jakub Ostrowski]

I agree with Frank, especially in the context of loops. They are sensitive to many physical parameters but also to spatial resolution. I would strongly oppose building any loop-related test suits without not been entirely convinced that resolution and convergence of the studied models is good enough as well as the rest of parameters in the used inlists.

Jakub

> On 30 Aug 2016, at 16:58, Francis Timmes <fxt44 at mac.com> wrote:
> 
> with all due respect, cepheids loops are but one part of the broad topic 
> of stellar evolution. i oppose the tuning of default parameters to 
> fit a specific subtopic. it is not difficult to change an inlist.
> 
> fxt
> 
> 
> 
>> On Aug 30, 2016, at 7:35 AM, Hideyuki Saio <saio at astr.tohoku.ac.jp> wrote:
>> 
>> Hi,
>> 
>>> I would strongly oppose adding any kind of overshoot by default. This would likely be a source of significant confusion for many, and could possibly result in many publications inadvertently using overshooting they're unaware of. The amount of overshooting used would also be very arbitrary, and choosing a default would result in people using it just because it is a MESA default.
>> 
>> In general, I agree no overshooting in default setting.
>> 
>> But I think, the helium burning core is the exceptional case, in which  a very small amount of overshooting is essential  to obtain a realistic track.
>> 
>> Please look at the attached diagram, in which each panel shows 7Msol cepheid phase with different value of 
>>   overshoot_f_above_burn_he_core
>> 
>> cases of 0.0, 0.0005, 0.001, 0.002, 0.005 are shown.
>> 
>> Except for the case of no overshooting, I obtained very similar cepheid loops irrespective to the exact value of the overshooting (0.005 is probably too high).  
>> 
>> I still prefer  a default setting which produces a reasonable cepheid loop.
>> 
>> Best regards,
>> Hideyuki
>> 
>> <hrd_cep_7msol.pdf>
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