Re: [mesa-users] Convergence of models in the 11 - 14 Msun range

[Manos C. <ma...@fl...>]

Dear Bill et al.,

  Attached is the inlist I am using, with the latest version of MESA 
(6596) compiled with the latest version of MESASDK
for MacOSX. Running on 4 threads. Thank you for looking into this, in 
the meantime I will try to play around with
the overshooting parameter as you mentioned.

Manos
> Hi Manos,
>
> Please send inlists and all details necessary to reproduce a sample case.
> I'd like to know how far the evolution has gone when convergence fails.
> In the past, this mass range has ignited Ne20 off-center after C/O burning.
> It then takes a very large number of timesteps for the burning front to advance inward to the center.
> The advanced is limited by not being able to deplete the Ne20 over a significant mass range at once.
> With convection that works to help the burning go relatively quickly.
> For inward burning, there is no help from mixing --- unless you crank up overshooting below the burn.
> Without the help of overshooting to drive things inward faster, it has to creep inward bit by bit.
>
> -Bill
>
>
>
>
>
>
> On Jun 26, 2014, at 1:38 PM, Manos Chatzopoulos wrote:
>
>> Dear all,
>>
>>   Has anyone managed to have a converged MESA model all the way from
>> pre-MS to pre-supernova (core-collapse)
>> in this rather interesting mass range of 11 - 14 Msun? Stars around this
>> mass range are thought to make electron-capture
>> SN progenitors with O/Ne/Mg cores, but when I try running them they
>> always seem to fail to converge past
>> core C/O burning. Is this relevant to the core becoming significantly
>> degenerate? Any insight on this would be
>> appreciated.
>>
>> Best,
>>
>> Manos
>>
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