[Mesa-users] How to create C/O white dwarf of different abundances.

[harish sorrout]

Thanks Francis,

I have noticed one thing during the evolution of pre- main sequence to WD.
At one stage of evolution temp. Was not enough to burn carbon and oxygen,
but maximum energy was contributing from
Burn_c and burn_o reaction rate .  Can you please enlighten me in this
regard.

 Thank you in advance.

On Mon, 26 Oct, 2020, 09:59 Francis Timmes, <fxt44 at mac.com> wrote:

> hi harish,
>
> one approach is to evolve a ~0.5 to ~7 msun model from the pre-main
> sequence to a white dwarf.
> starting from a set of pre-main sequence initial conditions, precise
> predictions for the
> properties of the white dwarf model, especially the mass fraction
> profiles, do not exist due
> to the nonlinear system of equations being approximated. for example,
> variations in the
> carbon and oxygen profiles of the white dwarf model can be caused by the
> nuclear reaction rates,
> mixing and mass loss models, mass resolution, and time resolution. one can
> explore this approach
> in mesa by experimenting with the 1M_pre_ms_to_wd test suite case.
>
> another approach is to build an ab initio white dwarf model. by ab initio
> one means calculations
> that begin with a white dwarf model, as opposed to a white dwarf model
> that is the result of
> a stellar evolution calculation from the pre-main sequence. a potential
> disadvantage (or advantage)
> of ab initio white dwarf models is that the imposed initial mass fraction
> profiles may not be
> attainable by a stellar model evolved from the pre-main sequence. one can
> explore this approach
> in mesa by experimenting with josiah schwab's wd_builder
> https://github.com/jschwab/wd_builder .
>
> have fun!
>
> fxt
>
>
>
>
>
> > On Oct 24, 2020, at 8:02 AM, harish sorrout via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
> >
> > Hello,
> >  I want to create models of C/O white dwarf with different carbon oxygen
> abundance. So, which should be changed in inlist for such changes.
> > should i change reaction rates or net name.
> > kindly advise.
> > thank you in advance
> > Harish kumar
>
>
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