[Mesa-users] [Fe/H] Calculation with MESA Outputs

[Rob Farmer]

Please be specific in what fields you are using to calculate Fe/H, and what
values each term mesa is providing you.

Is this in a run_star_extras, or are you using history output or profile
data?

You think it's the nuclear network issue, so which network are you using
(inlists & run_star_extras.f90 would be helpful here)?

Thanks
Rob


On Mon, 1 Nov 2021 at 22:01, Mitchell Dennis <mtde226 at hawaii.edu> wrote:

> Dear MESA Mailing List,
>
>  I am writing to inquire about calculating the [Fe/H] metric using MESA
> outputs. Specifically, I am outputting the Iron mass fraction and the
> Hydrogen mass fraction at the surface of my model, but even when I give the
> inlist a metallicity Z > 0, my initial Fe abundance is zero (and remains at
> zero throughout the model). Because I am terminating my models at the tip
> of the red giant branch (TRGB), I do not expect the iron abundance to
> change substantially from core collapse to the TRGB, and MESA reflects this
> by not increasing the Iron mass fraction at all during my stellar model. I
> suspect this is due to the nuclear reaction network. Is this the case? How
> does MESA allocate initial metallicity between the various elements?
>
> Additionally, I was reading MESA paper on planets, oscillations, rotation,
> and massive stars which uses [Fe/H]s in Table as the log of the ratio of
> the surface (Z/X) relative to solar values. Is this drawing an equivalence
> between [Fe/H] and (Z/H), and would this be appropriate in my case at the
> TRGB? Bill Paxton *et al* 2013 *ApJS* *208* 4
>
> Additionally, does anyone have any suggestions for calculating [Fe/H]
> using MESA?
>
>
>
> Best Regards,
>
> Mitchell T Dennis
>
> Graduate Student
>
> Institute for Astronomy – UH Manoa
> _______________________________________________
> mesa-users at lists.mesastar.org
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