[Mesa-users] Mesastar Question: Setting Initial CO Abudance Enhancements

[KAYLA MARTIN]

Hi,

This is my first post on the mesa user list.

I am creating a model with X=0.732, Y=0.26, and Z=0.008, with the chemical
composition mixture of Grevesse & Sauval (1998). In this model, I need to
set [O/Fe]=+0.2 (equivalent to [O/H]=-0.1 or X(O)=0.0042), though I cannot
see a clear way to implement this in my model.

I have attempted to create an opacity table using the AESOPUS tool
<http://stev.oapd.inaf.it/cgi-bin/aesopus>, though it seems this only
applies at 'low temperatures' (the tool won't let me set higher than
Teff=log3.7)? Further, the implementation of the tables generated from this
tool are unclear -- the related instructions in mesa have outdated
information (last updates ~2013), and contains variables that no longer
exist in more recent mesa versions (e.g.,
$MESA_DIR/kap/preprocessor/README_creating_OPAL_type2_tables notes inlist
variables such as Zfrac_O).

Any guidance on how to correctly specify the initial oxygen abundance in my
model with a gs98 reference solar composition will be very helpful.

Thanks!
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