[mesa-users] overshoot_f_above_nonburn/burn_he/...

Umberto Battino umberto.battino at unibas.ch
Tue Jun 25 03:34:11 EDT 2013

Hi Ilka,
overshooting parameters are also constrained by hydrodinamical 3D simulations (e.g. Freytag et al. 1996, Herwig 2007 etc...).. I can tell you something for low/intermediate mass stars.. where a classic setting is given by setting f=0.014 to all the boundaries, except for the helium ones, where a lower value is recommended (f=0.008). Consider these just as indicative values, then it depends much more on the specific model you want to compute.. for example during the so called "Third dredge up" events during the AGB phase the f value under the hydrogen convective envelope is generally multiplied by a factor of 9 using the inlist command "overshoot_below_noburn_factor".
Check  also Herwig 2000 paper for more details! (Astron. Astrophys. 360, 952–968 (2000)). This will surely be useful.. :)


From: Roni Waldman [roni181066 at gmail.com]
Sent: Tuesday, June 25, 2013 8:59 AM
To: Ilka Petermann
Cc: mesa-users
Subject: Re: [mesa-users] overshoot_f_above_nonburn/burn_he/...

Hi Ilka and MESA users,
As far as I know, the only observational evidence is that which you mention, and it is relevant for the main sequence, i.e. overshoot above the H burning core.
People usually use the same parameters for all other convective regions just because there is no better thing to do.
If anybody knows otherwise, I will be happy to be corrected.

On Mon, Jun 24, 2013 at 10:44 PM, Ilka Petermann <m.ilka at gmx.de<mailto:m.ilka at gmx.de>> wrote:
Dear MESA users,
I want to implement overshooting in my calculations and have a question about the MESA parameters describing it.
If I understood correctly, a value for overshooting (e.g. overshoot_f_above_burn_h) is adjusted to match the width of the main sequence or to fit properties determined by asteroseismology,...
However, there are also parameters for overshoot_f_above_nonburn/burn_he/burn_z? Is there a 'common recipe' to assign values to these?

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