[mesa-users] Converging an AGSS05 Solar model

Wed Aug 10 11:10:21 EDT 2016

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<mailto: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<mailto: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

------------------------------------------------------------------------------
What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at an interface-level. Reveals which users, apps, and protocols are
consuming the most bandwidth. Provides multi-vendor support for NetFlow,
J-Flow, sFlow and other flows. Make informed decisions using capacity
planning reports. http://sdm.link/zohodev2dev
_______________________________________________
mesa-users mailing list
mesa-users at lists.sourceforge.net<mailto:mesa-users at lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/mesa-users

------------------------------------------------------------------------------
What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at an interface-level. Reveals which users, apps, and protocols are
consuming the most bandwidth. Provides multi-vendor support for NetFlow,
J-Flow, sFlow and other flows. Make informed decisions using capacity
planning reports. http://sdm.link/zohodev2dev
_______________________________________________
mesa-users mailing list
mesa-users at lists.sourceforge.net<mailto:mesa-users at lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/mesa-users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20160810/b3c94299/attachment.html>