[mesa-users] overshooting problem

Jakub Ostrowski ostrowski at astro.uni.wroc.pl
Fri Jun 28 05:52:43 EDT 2013


Hi,

Thank you for your response. I'm aware of these problem you pointed out and I have no answer to them. I'm attaching runs of gradients for these two supergiant models. The first figure shows the whole star whereas the second one depicts the same range of logT as my previous plots.
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I think Ledoux criterion is still used when overshooting is enabled because I have semi-convection zones in my models. I also made calculations with Schwarzschild criterion and enabled overshooting and there is the same problem.

Cheers,
Jakub

> Hi,
> 
> Would it be possible to see the distribution of gradT_rad, gradT and gradT_ad for these models? What is strange at first sight is that with overshoot the ICZ is located in the mu-grad region while it is strictly in the homogeneous envelope without overshoot. 
> The N2 distributions shown in the last figure is worrisome since you should have an ICZ corresponding to the mixed layers shown in the XY figure and it does not show up in N2. On the other hand, the noisy appearance of N2 makes me think of the Schwarzschild criterion. Are you sure the Ledoux criterion is still used when overshooting is different from zero?
> Cheers,
> Arlette Noels


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