[Mesa-users] degeneracy parameter

[Jason Wright]

Excellent!  Thank you!  Things are now working swimmingly.

The electron density I get via that equation now agrees with the value I
get using the partial degeneracy electron density equation almost
perfectly, (except in the core where it's off by <1%, consistent with the
expected magnitude of relativistic corrections, and except in upper
atmosphere where things are off a lot, but the density is extremely low
there and perhaps other real gas effects are becoming important.)

Jason

On Tue, Feb 23, 2021 at 2:44 PM Josiah Schwab <jwschwab at ucsc.edu> wrote:

> Hi Jason,
>
>  it seems to be a problem with the reporting when we're on FreeEOS.
>>
>
> Found the problem.  There is a natural log / log base 10 issue in some of
> the EOS table writing / loading code.
>
> I think you can reinterpret the value you were getting as
>
>   true free_e = exp(ln(reported free_e) / ln(10))
>
> I can't provide a source code fix at the moment, but we'll work on getting
> this cleaned up.  For most models, this should just be a cosmetic issue.
>
> Josiah
>


-- 
                                                -
---------------
Jason T Wright
Professor of Astronomy & Astrophysics
Director, Penn State Extraterrestrial Intelligence Center
Acting Director, Center for Exoplanets and Habitable Worlds
NEID Instrument Team Project Scientist <http://neid.psu.edu/>
he/him/his
*https://sites.psu.edu/astrowright/ <https://sites.psu.edu/astrowright/>*
@Astro_Wright

<http://twitter.com/Astro_Wright>
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