[Mesa-users] White dwarf cooling for different compositions

[Rob Farmer]

Hi

The issue is that you need more than 8 isotopes in your composition.dat
file, it must have the same number of isotopes as the nuclear network
chosen. You can look in the wd_0.6.mod file (the model you are loading) and
see that it uses 11 species so you need 11 columns and set the isotope
count to 11.

Rob


On Mon, 9 Jul 2018 at 18:10, Héctor MR via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

>   Hi Na'ama,
>
> The resulting abundance plot seems fine, but I don't see any difference in
>> the cooling track when I edit the composition.dat file. What am I doing
>> wrong?
>>
>
>   Have you plotted the different cooling tracks altogether using any of
> the MESA output tools (e.g. Bill Wolf's Python package), or are you looking
> at the PGSTAR output from your various inlists, one after another? In
> addition, are you sure that relax_initial_composition is working properly?
> I would use the same number of shells that the model has, as well as more
> steps to relax.
>
>
>> In addition, the wd_cool_0.6M test uses a wd_0.6.mod model that starts
>> from an effective temperature of ~17000K, so it messes up the age. How can
>> I start from a hotter WD?
>>
>
>   You can relax the initial mass of your model (
> http://mesa.sourceforge.net/star_job_defaults.html#relax_initial_mass) to
> get different physical conditions for the WD. If you really want to be
> specific about your ages and composition, you can also create your own
> pre-main sequence model (
> http://mesa.sourceforge.net/star_job_defaults.html#create_pre_main_sequence_model)
> and then evolve it until the WD cooling track. Although they correspond to
> an older MESA version with no ne22 sedimentation, feel free to take a look
> at my neutronization inlists (
> http://cococubed.asu.edu/mesa_market/inlists.html), where I created WDs
> and then stripped their envelopes, relaxed their initial masses...
>
>
>   --
>   H.
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>
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