[Mesa-users] Ask Questions

[Wulandari]

Dear Mr. Pablo Marchant,

Thank you for your answer, but I still confused, can i ask you a question
again?
You said that we can used that syntax if our star reach thermal
equilibrium. So what we should do to make our star run until reach thermal
equilibrium, is there is relation with the constraint that we should make?

Thank you.

Best regards,

Pada tanggal Sab, 27 Okt 2018 pukul 17.47 Pablo Marchant <pamarca at gmail.com>
menulis:

> There is the option of relaxing the helium and metal fractions to a
> desired composition. You have to be careful when doing this though, as the
> resulting model with have an arbitrary thermal state, and you should wait
> until it reaches thermal equilibrium to trust further results. To do this
> you should use in your star_job
>
>       set_uniform_initial_composition = .true.
>       initial_h1 = 0.70d0
>       initial_h2 = 0d0
>       initial_he3 = 0d0
>       initial_he4 = 0.28d0
>
>       relax_initial_Z = .true.
>       new_Z = 0.00034
>       relax_initial_Y = .true.
>       new_Y = 0.248246d0
>
> If you're using type2 opacities, you should take care of adjusting Zbase
> appropriately.
>
> If you want to check an example where this is used, see the test_suite
> case in binary/test_suite/double_bh, and check either inlist1 or inlist2
>
> Cheers
>
> On Sat, Oct 27, 2018 at 2:12 PM RICHARD H D TOWNSEND via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
>
>> Hi Wulandari --
>>
>> Thanks for your question! The answer to your question is no. if you set
>> 'create_pre_main_sequence_model = .false.', then MESA constructs the
>> starting model from a set of pre-built (zero-age main sequence) models
>> which have solar metallicity. Trying to set a metallicity other than solar
>> with these pre-built models will result in an error.
>>
>> Best wishes,
>>
>> Rich
>>
>> > On Oct 27, 2018, at 2:34 AM, Wulandari via Mesa-users <
>> mesa-users at lists.mesastar.org> wrote:
>> >
>> > Dear Mr/Mrs,
>> > Good Afternoon,
>> >
>> > I'm Wulandari, student in Astronomy Department of Institut Teknologi
>> Bandung, Indonesia.
>> >
>> > I get a task about stellar physics and using MESA programme to do my
>> task. I research on HD 122563 which is Red Giant Branch star and has low
>> metallicity.
>> > I want to ask questions. If I set 'create_pre_main_sequence_model =
>> .false.' in inlist_project, can i set metallicity of the star below solar
>> metallicity?
>> >
>> > Thank you for your kindness.
>> >
>> > Best regards,
>> > --
>> > Wulandari
>> > Department of Astronomy
>> > Institut Teknologi Bandung, Indonesia
>> > +6285322087245
>> > _______________________________________________
>> > mesa-users at lists.mesastar.org
>> > https://lists.mesastar.org/mailman/listinfo/mesa-users
>> >
>>
>> _______________________________________________
>> mesa-users at lists.mesastar.org
>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>
>>
>
> --
> Pablo Marchant Campos
> M.Sc on Astrophysics, Universidad Católica de Chile
> PhD on Astrophysics, Argelander-Institut für Astronomie, Universität Bonn
>


-- 
Wulandari
Department of Astronomy
Institut Teknologi Bandung, Indonesia
+6285322087245
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