[mesa-users] CO cores

[Tuguldur Sukhbold]

Bill, 

thanks a lot for these! If you remember, couple of months ago we had some trouble running bare CO cores until preSN. Eventually we figured out few cases, but they were producing an iron core much smaller than KEPLER's. We thought differences in the codes during Si burning might be affecting the preSN results, so we decided to run MESA models only until core oxygen depletion.

But these plots are very interesting. With KEPLER we get iron core masses of:

CO core mass	Iron core mass at preSN
3				1.57
15				1.89

Eyeballing from your figures these numbers look very close. What composition did you use for 15Msun core? I hope you used the equation I provided in the original email…

We have been running 100s of full star and bare core models. Before we finish analyzing them and writing the paper, a new version of MESA comes up offering better results. This happened twice already, I guess now it is the 3rd time. :-D

thanks,
Tuguldur






On Jul 22, 2013, at 5:25 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

> Hi,
> 
> I've just run a "modern interpretation" of your CO cores inlist in my current version (5245), and it works rather nicely!  ;p
> initial model (3Msun) is set to uniform composition C and O (as in your inlist).
> from start to core collapse takes 7.5 minutes on my 12 core Mac; 1925 steps with 19 retries and 10 backups.
> I'm using approx32 (my new favorite net)
> 
>        neut h1 he3 he4 prot 
>        c12 n14
>        o16
>       ne20
>       mg24   
>       si28
>        s32
>       ar36
>       ca40 ca42 ca44 ca46
>       ti44           ti50
>       cr48           cr54 cr56
>       fe52 fe54 fe56 fe58 fe60
>       ni56 ni58 ni60 ni62 ni64      
> 
> This example is now in the "make_low_mid_mass_with_uniform_composition" test case,
> so you can get inlists for it there.
> 
> Final model looks like this:
> !DSPAM:10228,51edcde016481302168972!
> <Abundances.pdf>
> !DSPAM:10228,51edcde016481302168972!
> <plot_T_RHO.pdf>
> !DSPAM:10228,51edcde016481302168972!
> <duo_logRho_Ye.pdf>
> !DSPAM:10228,51edcde016481302168972!
> <duo_velocity_v_div_r.pdf>
> 
> I've also changed the "make_massive_with_uniform_composition" test case to do a 15 Msun uniform C/O to core collapse.
> It also runs without too much trouble.   it takes 7.8 minutes to run to collapse -- 1370 steps, 85 retries, and 74 backups.
> !DSPAM:10228,51edcde016481302168972!
> <Abundances.pdf>
> !DSPAM:10228,51edcde016481302168972!
> <plot_T_RHO.pdf>
> !DSPAM:10228,51edcde016481302168972!
> <duo_logRho_Ye.pdf>
> !DSPAM:10228,51edcde016481302168972!
> <duo_velocity_v_div_r.pdf>
> 
> Cheers,
> Bill
> 
> 
> !DSPAM:10228,51edcde016481302168972!
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