[mesa-users] The Cepheid phase

Francis Timmes fxt44 at mac.com
Tue Aug 30 10:58:31 EDT 2016


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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