[Mesa-users] Varying radiative opacity

[Jeremy Sakstein]

Hi Evan,

This makes perfect sense.

Thanks.

I will play around with the other_kap hook.

Cheers,

Jeremy

On Wed, Mar 30, 2022 at 10:06 AM Evan Bauer <evan.bauer.astro at gmail.com>
wrote:

> Hi Jeremy,
>
> I believe your suspicion is right, and the opacity_factor control will
> scale the net opacity (including conduction), so you can’t do what you want
> with an inlist option.
>
> In the most recent MESA release, it would be quite straightforward to
> implement what you want in your run_star_extras using the
> kap/other/other_radiative_opacity.f90 hook.
>
> The hooks back in r12778 don’t give you quite as direct of access, but I
> imagine you could find a roundabout way of modifying just the radiative
> opacity. E.g. you could use the star/other/other_kap.f90 hook along with
> the kap/public function kap_get_elect_cond_opacity. That would allow you to
> subtract out the conductive opacity, modify what’s left by the factor you
> want, and then add the conductive opacity back in when you’re done. Does
> that make sense?
>
> Cheers,
> Evan
>
> On Mar 29, 2022, at 3:58 PM, Jeremy Sakstein <sakstein at hawaii.edu> wrote:
>
> Hi everyone,
>
> I'm trying to vary the radiative opacity leaving the conduction opacity
> fixed in r12778.
>
> Does anyone have any suggestions for the best way to do this?
>
> I noticed the option opacity_factor in the controls but I am unsure what
> this scales. Currently, I have include_electron_conduction = .true. so my
> suspicion is that it will multiply the sum of the conduction and radiative
> opacities.
>
> Is there any way to just scale the radiative opacities?
>
> Cheers,
>
> Jeremy
>
> --
> Jeremy Sakstein (He/Him/His)
> Assistant Professor of Theoretical Physics
> Department of Physics & Astronomy
> University of Hawaiʻi at Mānoa
> Watanabe Hall
> 2505 Correa Road
> Honolulu, HI, 96822, USA
> http://www.jeremysakstein.com
> _______________________________________________
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>
>
>

-- 
Jeremy Sakstein (He/Him/His)
Assistant Professor of Theoretical Physics
Department of Physics & Astronomy
University of Hawaiʻi at Mānoa
Watanabe Hall
2505 Correa Road
Honolulu, HI, 96822, USA
http://www.jeremysakstein.com
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