[mesa-users] Finer control of mass change in star for binary evolution

Pablo Marchant pamarca at gmail.com
Mon Dec 10 14:31:40 EST 2012

For my purposes it would fit me to be able to specify a routine to be
called right after do_winds, in order to get this precise adjusting.

On Mon, Dec 10, 2012 at 6:33 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

> Hi Pablo,
> I'm happy to add another hook -- let me know what you want and it will
> appear!  ;-)
> Cheers,
> Bill
> On Dec 10, 2012, at 7:55 AM, Pablo Marchant wrote:
> > Hi! While working on implementing the binary evolution part of MESA I've
> come across something that I don't know if it's possible to implement right
> now. In mixing the effect of winds and mass transfer, I would expect to do
> the following for each star in the system:
> >
> > - For the donor, set as mdot the result of max(abs(wind_mdot),
> abs(rlof_mdot)), with the appropiate sign of course. This is already done,
> but the problem is that the calculation of the wind is completely contained
> in the do_wind routine, for which the end result is the setting of mdot
> that will be used to adjust the mass as said above. However there is no way
> to differentiate (as far as I can see) what part of the final mdot is due
> to winds and which is due to mass transfer. This is important because I
> need to update the total angular momentum of the system accordingly.
> >
> > - For the accretor, I would like to add up the mdot from the wind, and
> the one from mass accretion.This is not done right now, and the criteria to
> set the wind is the same as described above, max(abs(wind_mdot),
> abs(rlof_mdot)), which doesn't really make sense  for the accretor. And
> once again, I need to know precisely in the end what corresponds to mass
> accretion and what to winds, in order not just to update the total angular
> momentum of the system, but also to properly set the composition of the
> accreted material.
> >
> > I don't know really if there is a proper way to do this right now. I
> guess the most natural way I can imagine, would be to have a user defined
> function to specify mass accretion, which is called right after do_winds.
> In this way I could do what I describe above by modifying mstar_dot in an
> appropiate way. Any suggestions?
> >
> > Cheers!
> >
> > --
> > Pablo Marchant Campos
> > M.Sc on Astrophysics, Universidad Católica de Chile
> > PhD student, Argelander-Institut für Astronomie
> >
> >
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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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