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

[Bill Paxton]

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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