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

[Bill Paxton]

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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