[Mesa-users] surf_avg_omega_div_omega_crit shooting over 1 in later stages!

[Francis Timmes]

hi amar,

nothing prevents the output quantity surf_avg_omega_div_omega_crit from being greater than unity.
when this happens, presumably dynamic events occur - this is what your plot suggests happen.
perhaps explore the models in more detail (mass loss?) around when surf_avg_omega_div_omega_crit 
spikes and subsequently decreases sharply.

fxt





> On Sep 29, 2022, at 11:36 PM, Amar Aryan via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Dear mesa user,
> 
> OS : Ubuntu 20.04
> MESA : r22.05.1
> 
> I am trying to study the effects of rotation on the final fate of a 25 solar mass ZAMS star. I am using the 20M_pre_ms_to_core_collapse test suit directory. Further, to implement different rotations, I am setting new_omega_div_omega_crit to desired values (i.e., 0.0, 0.2, 0.4, 0.6, and 0.8 ) in inlist_mass_Z_wind_rotation. I could successfully evolve the models up to the stage of core collapse. Later, to see the implemented rotation speeds, I plotted the "surf_avg_omega_div_omega_crit" against the "star_age" for the evolution period between near ZAMS up to the exhaustion of core he burn (plot attached). Surprisingly, I found out that for "new_omega_div_omega_crit = 0.6 and 0.8", the "surf_avg_omega_div_omega_crit" went beyond 1 for a shorter period during last stages.
> 
> <omega_plot.png>
> 
> I just wanted to know if such over shootings of surf_avg_omega_div_omega_crit beyond 1 are fine or not plus what could be the possible reason? Please enlighten me.
> 
> With  best regards,
> Amar Aryan 
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