[mesa-users] Converging an AGSS05 Solar model

[Aldo Serenelli]

Hi Farag, 

check in detail your inputs (tabulated abundances, your target values, etc). It's not harder for codes to give Z/X for AGS05 (just one S here) and L, R = 1 than for any other abundances.

Cheers.

Aldo

On 10 Aug, 2016, at 5:10 PM, Farag, Ebraheem Khaled wrote:

> Hello,
> 
>     I will begin trying to using the solar_calibration model. Also, When I set:
> 
>      create_pre_main_sequence_model = .true.
> 
> the model errors and fails to converge no matter the mixing parameter or initial abundances I try. Nonetheless, thank you all for your help, and please let me know if you are able to successfully converge an AGS05 model if possible.
> 
> Ebraheem 
> From: Aaron Dotter <aaron.dotter at gmail.com>
> Sent: Wednesday, August 10, 2016 9:02 AM
> To: Robert Farmer
> Cc: Farag, Ebraheem Khaled; mesa-users at lists.sourceforge.net group
> Subject: Re: [mesa-users] Converging an AGSS05 Solar model
>  
> Hi Ebraheem,
> 
> It is more difficult to fit the solar sound speed profile with the Asplund et al. (2004) solar abundances than it is with the older Grevesse & Noels (1993) or Grevesse & Sauval (1998).  This is a common result in the literature and has been the subject of many studies.  See, for example, these:
> 
> http://adsabs.harvard.edu/abs/2005ApJ...618.1049B
> http://adsabs.harvard.edu/abs/2009ApJ...705L.123S
> 
> 
> Aaron
> 
> On Tue, Aug 9, 2016 at 6:56 PM, Robert Farmer <rjfarmer at asu.edu> wrote:
> Hi
> 
> >initial_h1 =.0.6805
> Hopefully that is just a typo in the file you sent but it should be: (you have an extra .)
> initial_h1 =0.6805
> 
> >Still, I can't get the correct surface abundances of 0.0165=z/x along with L =1 and R=1.
> 
> How close do you get? Also what happens if you run from the pre-MS with your chosen composition? In star_job set:
> 
> create_pre_main_sequence_model = .true.
> 
> You might want to look at and run the solar_calibration (takes a while to run) with your choice of AGS05. This tries to make the "best" solar model by tweaking the inputs, look for its vary_ options in inlist_astero_search_controls and matching the model to the solar data.
> 
> Rob
> 
> 
> 
> On Tue, Aug 9, 2016 at 8:32 AM, Farag, Ebraheem Khaled <farag.11 at lanl.gov> wrote:
> Hello all,
>     
>     I'm attempting to converge an AGS05 model of the sun using the example_solar_model in the test_suite. This has worked for all other Opacities and abundances including AGSS09, GS_98, and GN_93. My current problem is that I can't seem to converge the model for the AGS05 opacities and abundances.
> 
>     I have set: 
>       z_frac = 5(Ags05 z fracs)
>       kappa_file_prefix = 'a05+Ne'
>       kappa_lowT_prefix = 'lowT_fa05_ags04' ! for lower temperatures.
> ------------------------
>     
> Still, I can't get the correct surface abundances of 0.0165=z/x along with L =1 and R=1. The one time I got very close, the sound speeds looked nothing like I believe they should(sound_standard.png).
> 
> ****Typically, after changing the Z-fracs and kappa files, I adjust the initial H1 and He4 along with he mixing length alpha to converge the model.***
> 
> Any tips?
> 
> Thanks,
> 
> Ebraheem
> 
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