[mesa-users] Decoupling opacities and metallicity

[Ylva Götberg]

Thanks so much Pablo, my test is working now! The idea was to check possible opacity and metallicity effects on mass transfer. Sorry, I should probably have mentioned that! 

Best,
Ylva


> On 30 Jun 2016, at 11:31, Pablo Marchant <pamarca at gmail.com> wrote:
> 
> Hi Ylva. A simple way to do that experiment is to use type2 opacities fixing Zbase to a lower metallicity than your model actually has. The difference between Zbase and the actual Z will be interpreted as CO enhancement, so its not exactly the same as using the lower metallicity tables though, but it should behave close to that. To force the model to strictly use lower metallicity tables, you can use use_other_kap to call the standard opacity routines but fixing the metallicity.
> 
> Can you share why you want to do this?
> 
> On Thu, Jun 30, 2016 at 10:32 AM, Ylva Götberg <y.l.l.gotberg at uva.nl <mailto:y.l.l.gotberg at uva.nl>> wrote:
> Hi all!
> 
> For testing purposes, I am trying to use the opacity tables for a low metallicity model in the high metallicity counterpart. I have been experimenting with the inlist settings, but find that these provide only a simpler approach where the opacity can be decreased by a factor or limited to a highest value for example. Now I am searching through the mesa/kap module, but cannot seem to find the place where this is set. Do you have any idea of how to redirect a high metallicity run to use the opacity of the corresponding model with low metallicity?
> 
> Hoping my question was clear,
> 
> Thanks in advance!
> Ylva (PhD in Amsterdam)
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> -- 
> Pablo Marchant Campos
> M.Sc on Astrophysics, Universidad Católica de Chile
> PhD student, Argelander-Institut für Astronomie

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