[mesa-users] wd diffusion

[Jing Luan]

Hi Bill,

Thank you very much :-)

It is the latter. A pure hydrogen atmosphere would be good enough. Since I
am studying wd's oscillation, the H-He transition would affect a little the
eigen frequencies, so it would be better if I have the H-He transition. The
hydrogen atm's mass is about 10^(-4) of the wd's mass. M_{wd} = 0.6Msun.
Teff ranges from 13000 to 9000, covering the instability strip for DAVs.

Many thanks!

Sincerely,
Jing

On Mon, Jan 9, 2017 at 10:35 AM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

> it would also be good to clarify your goals -- are you studying diffusion,
> or is diffusion just a way to create models for the topic you are actually
> interested in?  if the latter, then there may be other ways to create
> models for you with a pure H outer shell that use "stellar engineering"
> instead of diffusion.
>
> b
>
>
> On Jan 9, 2017, at 10:19 AM, Robert Farmer wrote:
>
> Hi
> Have you tried the wd_diffusion and/or the wd_surf_at_tau_1m4  test_suite
> cases?
>
> If you have and are still having problems, can you post your inlists with
> the changes you've made.
>
> Regards
> Rob
>
> On Sun, Jan 8, 2017 at 4:55 PM, Jing Luan <jingluan.xw at gmail.com> wrote:
>
>> Hello,
>>
>> I'd like to make a WD model with pure hydrogen atmosphere, i.e. all
>> heavier elements have settled down. Thus I turn on diffusion in mesa.
>> However, mesa has a hard time converging when I also require the surface
>> optical depth to be 5 or even lower (actually I need the low optical depth
>> part to be treated well in the model). Does anyone know that why diffusion
>> does not work well in low optical depth part please? Or how do I get a WD
>> model with hydrogen, helium and metals well separated in depth while its
>> surface goes up to tau=0.01 please?
>>
>> Many thanks!
>>
>> Sincerely,
>> Jing
>>
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