[Mesa-users] White dwarf cooling for different compositions

[Rob Farmer]

Hi
Showing inlists is the easiest way for us to help you. But did you also set

relax_initial_composition = .true.


Rob

On Mon, 9 Jul 2018 at 17:36, Na'ama Hallakoun <naama at wise.tau.ac.il> wrote:

> Hi,
>
> I'm new to MESA, and I'm trying to produce white dwarf cooling tracks for
> different compositions (i.e. changing the width of the He and H layers).
> I'm using the wd_cool_0.6M example from the test suite, where I added to
> the inlist_wd_cool_0.6M under &star_job:
>
> num_steps_to_relax_composition = 1 ! use this many steps to do conversion
> relax_composition_filename = 'composition.dat' ! file holding composition
> profile information
>
> and in composition.dat I have, for example:
> 6 8
> 0.00000 0.0 0.0 0.0 0.5 0.0 0.5 0.0 0.0
> 0.98999 0.0 0.0 0.0 0.5 0.0 0.5 0.0 0.0
> 0.99000 0.0 0.0 1.0 0.0 0.0 0.0 0.0 0.0
> 0.99989 0.0 0.0 1.0 0.0 0.0 0.0 0.0 0.0
> 0.99990 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
> 1.00000 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
>
> 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?
>
> 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?
>
> Thanks!
> Na'ama
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