[Mesa-users] Failed to find chi^2 for this run Error

[Aldo Serenelli]

Hi Erica,

a quick comment. Not really a mesa user, but it looks as if your 
Z_div/X_solar is off by one order of magnitude (at least if this should 
somewhat reflect a solar value to define the reference Fe/H=0 for the 
Sun), so the Fe/H in your model will be off by that amount as well. This 
could create a problem when trying to find a combination of Teff, Fe/H 
and stellar mass that makes more or less sense.

Could this be the issue?

Hope this helps.

Aldo



On 24/9/21 15:29, Erica Sawczynec wrote:
> Hi All,I’ve been trying to model a solar-like oscillator using the 
> astero module for some time now. I’ve recently gotten stuck because 
> the model always ends a step with a “failed to find chi^2 for this run 
> failed to get new chi^2 -- try again” error. I know that error is 
> pretty broad and can indicate a lot of things, but I’ve tried all my 
> usual fixes for this without success (including widening the error 
> bars on the observed constraints). I am also running 8-9 other physics 
> variations and none of the other variations have this same problem 
> even though all the observational constraints are the same. The only 
> difference between them is one knob has been changed (ie. like turning 
> diffusion off or using the OP opacities instead of the OPAL 
> opacities). I’m pretty confused as to why this particular list fails 
> each run but none of my other inlists seem to. I would really 
> appreciate a second set of eyes on this since I have been struggling 
> to get it to work for some time. I am running these models using MESA 
> 12115 and it’s matching mesasdk. I am using a modified 
> run_stars_extra.f file from one of Warrick’s summer schools a few 
> years ago (which I will also attach below), but that file has worked 
> with all my runs for several years without issue. I’ve also attached 
> my inlist_astero, inlist_astero_search_controls, and inlist_freq (Note 
> that my inlists were taken and modified from that same summer 
> school—thanks Warrick!).  Let me know if there is anything else useful 
> I can provide!Here is my OS version:
>
>     NAME="CentOS Linux"VERSION="7 (Core)"ID="centos"ID_LIKE="rhel
>     fedora"VERSION_ID="7"PRETTY_NAME="CentOS Linux 7
>     (Core)"ANSI_COLOR="0;31"CPE_NAME="cpe:/o:centos:centos:7"HOME_URL="https://www.centos.org/
>     <https://www.centos.org/>"BUG_REPORT_URL="https://bugs.centos.org/
>     <https://bugs.centos.org/>"CENTOS_MANTISBT_PROJECT="CentOS-7"CENTOS_MANTISBT_PROJECT_VERSION="7"REDHAT_SUPPORT_PRODUCT="centos"REDHAT_SUPPORT_PRODUCT_VERSION=“7"
>
> Thanks!
> Erica Sawczynec
>
>
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