[mesa-users] Reporting on a Slow Run with Paczynski_grey Atmosphere
Ehsan Moravveji
e.moravveji at gmail.com
Tue Apr 23 05:09:31 EDT 2013
Hello all,
I have noticed that there are two issues when I use
which_atm_option = 'Paczynski_grey'
1. The first is a huge drop in the computation speed. I have not bothered
with comparing the run-time with different atm options yet. The reason is
below.
2. Even more severe than that, with this atm option, the pre-main sequence
evolution cannot proceed, the time steps are extremely small, and the
change in global properties of the star are chaotic!
Please take a look at the attached pgstar figures.
The reason that I like to use Paczynski_grey is to be consistent with those
subroutines that generate equilibrium models for pulsation use in fgong,
osc formats etc. When one adds an atmosphere to the fgong model, then
Paczynski_grey is used for this purpose (correct me if I am wrong in this).
So, I thought: why not be consistent with that.
Can anybody explain why "Paczynski_grey" brings in so much issues?
Best regards.
Ehsan.
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