[mesa-users] Weird jumps in radius for rotating 8.1Msun model

Thu Jun 7 22:52:07 EDT 2012

In reply to you and Morgan, I attach a plot of evolutionary tracks in the HRD, for rotating models with initial masses 7, 7.2, 7.4, ... , 9.8, 10.

The black lines show models calculated with overshoot_f_above_burn_h = 0.014 --- these are the smoothest tracks, but still show some wiggles.

The red lines show the corresponding tracks with use_Ledoux_criterion = .true. and alpha_semiconvection = 0.1. These show some jumps in Teff	caused by jumps in R.

Finally, the green lines show the tracks without any 'fixes'. These are the jumpiest of all.

Unfortunately, it seems that while the fixes work to varying extents they also cause a significant change in the evolutionary tracks especially at lower masses. So, I'm not sure whether the smoothest tracks are necessary the most 'correct'.

cheers,

Rich

PS I attach a sample inlist for the 7 Msun case.

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On Jun 7, 2012, at 5:51 PM, Tuguldur Sukhbold wrote:

> Dear Rich,
> 
> what kind of models had those bumps with Ledoux?
> 
> was it your 7-10Msun rotating models? if so, can you please provide me your inlist?
> 
> thanks,
> Tuguldur
> 
> 
> 
> 
> 
> 
> Jun 7, 2012, в 3:16 PM, Richard Townsend написал(а):
> 
>> Alas, my prognosis was premature; the use_Ledoux_criterion does not fix the radius jump in all cases. However, it seems Aaron's suggestion, to use 
>> 
>> overshoot_f_above_burn_h = 0.014
>> 
>> ...does work.
>> 
>> cheers,
>> 
>> Rich
>> 
>> On Jun 7, 2012, at 12:28 PM, Richard Townsend wrote:
>> 
>>> That seems to do the trick. Thanks, everyone, for your input.
>>> 
>>> cheers,
>>> 
>>> Rich
>>> 
>>> On Jun 7, 2012, at 8:39 AM, Tuguldur Sukhbold wrote:
>>> 
>>>> Dear mesa-users,
>>>> 
>>>> I had couple of other people asking me before about this issue. As Hideyuki mentioned before, I think this is due 'sudden mixing' of H rich material into the core. I am not sure if restricting overshooting will make it smooth -always-, but changing the convection criterion will certainly fix the problem.
>>>> 
>>>> Attached are h1 & he4 fractions as a function of age during the main sequence for 77Msun model run with Schwarschild and Ledoux with 0.1 multiplier. 
>>>> 
>>>> add these into your &controls
>>>> 
>>>>    use_Ledoux_criterion = .true.
>>>>    alpha_semiconvection = 0.1
>>>> 
>>>> clear skies,
>>>> Tuguldur
>>>> 
>>>> 
>>>> <Screen shot 2012-06-07 at 6.26.07 AM.png>
>>>> <Screen shot 2012-06-07 at 6.32.28 AM.png>
>>>> 
>>>> On Jun 7, 2012, at 6:20 AM, Aaron Dotter wrote:
>>>> 
>>>>> Hi Rich,
>>>>> 
>>>>> This sort of problem can often be seen in main sequence evolution of stars with convective cores.  Some amount of mixing across the (Schwarzschild) convective core boundary ought to make it go away.  Try, for example,
>>>>> 
>>>>>          overshoot_f_above_burn_h = 0.014
>>>>> 
>>>>> Does that make the MS evolution look smooth?
>>>>> 
>>>>> Aaron
>>>>> 
>>>>> 
>>>>> On Wed, Jun 6, 2012 at 9:58 PM, Richard Townsend <townsend at astro.wisc.edu> wrote:
>>>>> Hi folks --
>>>>> 
>>>>> When I run an 8.1Msun model from ZAMS to TAMS with the inclusion of rotation (see attached inlist), I find strange jumps in the stellar radius from one model to the next (see attached radius vs time plot). Similar jumps show up for masses in the wider interval 7Msun - 10Msun.
>>>>> 
>>>>> What am I doing wrong here?
>>>>> 
>>>>> cheers,
>>>>> 
>>>>> Rich
>>>>> 
>>>>> 
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>>>> ____________________________________
>>>> 
>>>> Tuguldur Sukhbold
>>>> Astrophysics Graduate Student at UCSC
>>>> 
>>>> www.ucolick.org/~sukhbold/
>>>> 
>>>> 'science is interesting and if you don't agree you can fuck off' 
>>>> Editor of the New Scientist Magazine
>>>> 
>>> 
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