[mesa-users] issue with OP AGSS09

[Bill Paxton]

Hi Aaron,

Thanks for finding the problem!  

On the Type2 topic, do you have experience with creating Type2 tables with OP opacities?

-B



On Oct 12, 2013, at 1:34 AM, Aaron Dotter wrote:

> Hi Radek,
> 
> - at the moment using OP A09 for any problem dealing with large log T is simply wrong?
> 
> Well, for logT > 8 it is wrong.
>  
> - can we simply fix this and tell kap module to make blending at lower logT? (does the source of opacities at large  logT extend also down to logT=8 and is reliable there?)
> 
> Currently the blend with compton opacities is hard-wired in the code between log T = 8.2 and 8.7.  However, the control over how to blend between the Type1 and Type2 tables is in the user's control --  see the kap controls section of star_job.defaults for more information.
> 
> [In case all the Type1/Type2 nonsense is confusing to anyone reading this, the OPAL naming convention is tables for which the relative metal fractions stay fixed is Type1 and those for which the C and O fractions are taken separately from "Z" are Type2.]
> 
> I would recommend that you (a) use the Type2 tables and (b) put the transition between Type1 and Type2 at logT=8.  That should take care of the missing data in the OP tables AND the problem of properly accounting for the results of He-burning, which ought to be done anyway.
> 
> - does anyone know why the OP web application now produces the results only to logT=8, while for OP GS98 it was possible to go logT=8.7 (how OP gs98 file was prepared: with web application or OPCD software?)
> 
> As far as I am aware, the OPCD software always officially supported up to logT = 8 for as long as I've been following it.  The OP GS98 file distributed with MESA is one that was directly available on their webpage, current link is broken.  The more recent tables the format has changed somewhat and is sloppier now than it used to be.  I don't know how that GS98.OP17 file was generated, but I suspect it was made by someone within the OP collaboration.
> 
> Aaron
> 
>  
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