[mesa-users] Profiles of a white dwarf model from one solar mass main sequence star, taking element diffusion into account.

[Shane Frewen]

Have you tried the same model with MESA version 4930? When I tried that the
n14 abundance didn't show a spike outside of the c12 region.

Good luck,
  Shane Frewen


On Thu, Apr 25, 2013 at 2:01 AM, 陈彦辉 <yanhuichen1987 at ynao.ac.cn> wrote:

>
> MESA version: 4298
>
> I evolve a white dwarf model with 1M_pre_ms_to_wd, including
> 'do_element_diffusion = .true.'. When log_L_lower_limit = -0.5, I obtain
> the model which has profile of 1M_wd_L-0.5.png in the attachment. Then, the
> saved (pre) white dwarf model is cooled down to 11000 K (effective
> temperature) in wd_cool_0.6M, also taking element diffusion into account.
> Namely, the last model is a fully evolutionary white dwarf model. The
> profiles and parameters are showed in the attachment. I am puzzled about
> the n14 profile. The species are added to 7, as showed below.
>
>          diffusion_num_classes = 7 ! number of classes of species for
> diffusion calculations
>          diffusion_class_representative(1) = 'h1'
>          diffusion_class_representative(2) = 'he3'
>          diffusion_class_represent ative(3) = 'he4'
>          diffusion_class_representative(4) = 'c12'
>          diffusion_class_representative(5) = 'n14'
>          diffusion_class_representative(6) = 'o16'
>          diffusion_class_representative(7) = 'fe56'
>
>          ! in ascending order.  species goes into 1st class with A_max >=
> species A
>          diffusion_class_A_max(1) = 2
>          diffusion_class_A_max(2) = 3
>          diffusion_class_A_max(3) = 4
>          diffusion_class_A_max(4) = 12
>          diffusion_class_A_max(5) = 14
>   &nb sp;      diffusion_class_A_max(6) = 16
>          diffusion_class_A_max(7) = 10000
>
>          ! typical charges for use if diffusion_calculates_ionization is
> false
>          diffusion_class_typical_charge(1) = 1
>          diffusion_class_typical_charge(2) = 2
>          diffusion_class_typical_charge(3) = 2
>          diffusion_class_typical_charge(4) = 6
>          diffusion_class_typical_charge(5) = 7
>          diffusion_class_typical_charge(6) = 8
>          diffusion_class_typical_charge(7) = 21 ! Thoul et al use this for
> Fe in t he sun
>
>
>
>
>
>
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