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

[Erica Sawczynec]

Hi Aldo,
	This totally fixed the problem. I feel like a goon for missing something so simple! Thanks for your help!
Erica

> On Sep 24, 2021, at 8:41 AM, Aldo Serenelli <aldos at ice.csic.es> wrote:
> 
> 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
>> 
>> 
>> 
>> 
>> 
>> 
>> _______________________________________________
>> mesa-users at lists.mesastar.org <mailto:mesa-users at lists.mesastar.org>
>> https://lists.mesastar.org/mailman/listinfo/mesa-users <https://lists.mesastar.org/mailman/listinfo/mesa-users>
>> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20210924/bbd9069b/attachment.htm>