[Mesa-users] other_wind vs other_adjust_mdot

[Abha Vishwakarma]

Hi Jared,

Thanks a lot! This was quite helpful :) I think other_wind should do the
trick.

Cheers,
Abha

On Thu, Jun 27, 2024 at 1:04 PM Jared Goldberg <
jgoldberg at flatironinstitute.org> wrote:

> Hi Abha,
>
> For your case, it sounds like other_wind will work.
>
> For some recent tutorial material, we discuss implementing an other_wind
> in the Tuesday Minilab 3 of the 2024 MESA Down Under "Summer" (winter)
> school, linked here
> <https://sites.google.com/view/massive-stars-mesa-down-under/minilab3>.
>
> In general, both other_wind and other_adjust_mdot can be used for mass
> loss. Other_adjust_mdot digs a bit more into the guts of the star, setting
> the mdot parameter in the star pointer (s% ) and modifying it directly.
> Since other_adjust_mdot can be positive or negative, it's good for
> accretion or other schemes where the star is allowed to either gain or lose
> mass. Other_wind is purely for mass *loss*; it is called relatively early
> in the evolution loop, before some variables are set (which if needed, you
> can get around by actively initializing the star pointer, as we do in Lab 3
> Task 2 of the linked lab). The advantage of using other_wind is that it
> enforces mdot <= 0, so your mass loss scheme will not accidentally become
> accretion as a result of numerical or implementation errors. Additionally,
> other_wind takes in surface properties of the star and does not require
> access to the full star pointer (though you can initialize the star pointer
> s% and use it if needed).
>
> Hope this helps!
>
> Cheers,
> ~Jared
>
> On Wed, Jun 26, 2024 at 10:56 PM Abha Vishwakarma via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
>
>> Dear MESA Users,
>>
>> I wanted to implement a custom mass loss scheme from the surface of a red
>> giant star, but I am confused between the two choices - using other_wind or
>> other_adjust_mdot . I would like to remove mass using an exponential mass
>> loss function that depends on time. Currently, the key difference that I
>> know is that I need to set the " w " parameter in other_wind , whereas in
>> the  other_adjust_mdot hook I need to set " s% mstar_dot ". I think the
>> other_wind hook should work, but should I use it?
>>
>> I would like to know which of these would be relevant for my case, and
>> get some insight into the differences between these two hooks.
>>
>> Best,
>> Abha
>>
>> -----------------------------------------------------------------
>> *Abha Vishwakarma*
>> Final Year Int. M.Sc.
>> NISER, India
>> Mail: abha.vishwakarma at niser.ac.in
>> Web: sites.google.com/view/abhavishwakarma/
>>
>>
>> _______________________________________________
>> mesa-users at lists.mesastar.org
>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>
>>
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