[Mesa-users] Having excessive surface pulsations in late stellar evolution of massive stars.

[Francis Timmes]

hi sohan,

yes. this is being investigated.

fxt



> On Apr 12, 2021, at 7:32 PM, Sohan Ghodla <sgho069 at aucklanduni.ac.nz> wrote:
> 
> Hi everyone,
> 
> My name is Sohan and I'm relatively new to MESA. I have been trying to create models of massive stars in MESA (mass ranging from 10-300 M_sun) for about a month now.
> 
> I understand that different masses could require different input settings but my current setting mostly works (at least for the stellar interiors)
> 
> My questions are the following:
> 
> 1) My models (for mass >= 40Msun and zero initial rotation) begin to show large pulsations on the HR diagram once the carbon in the core is near exhaustion (pic attached). I have tried raising the Pextra_factor (in inlist_massive_defaults) which does help in lowering the pulsations but doesn't settle the issue. Can someone guess what might be causing these pulsations? I have tried varying the overshoot_f and overshoot_f0  and Mixing length variables but that didn't seem to help either.
>    
>  2) Is it possible to somehow lower the surface Luminosity (on the HR diagram) while keeping the Teff unchanged for these models (M >= 70Msun). I guess that this could be done by modifying the pre-ZAMS evolution but not sure.
>     
> I have attached my inlists and a few pics.
>     
>  Thank you
>  Sohan Ghodla
> <50M_sun.png><inlist_massive_defaults><inlist_set_alpha_mlt><inlist_common><70M_sun.png><inlist_zams>_______________________________________________
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