It's a perfect model for such, I use it in Celestia Origin and modified the largest stars section in the "special stars" folder to have them, though the large_magellanic_cloud file in the stars_ouside_our_milky_way folder also replaces stars like WOH G 64, so I also modified that to render such stars with the model and texture.
I also use "red-supergiant.png" texture which I found in the extragalactic_stars_extras.zip file from SevenSpheres via
https://celestia.space/forum/viewtopic.php?f=23&t=19978&p=152350&hilit=extragalactic+stars#p152350 as a texture for red supergiants like Mu Cephei, NML Cygni, the LGGS stars (which I made an addon of and with their rotation periods rendered to 30360 hours to prevent periods of an unrealistic 1.3 Earth days), and such as they appear to be cooler and calmer based on the data while the others seem to show more violent activity which the RSG.png texture fits with.
The yellow-hypergiant.png texture's being used for G and K class supergiants/hypergiants (even though the RSG.cmod mesh's still being rendered).
https://celestia.space/forum/viewtopic.php?f=6&t=20398&p=153995&hilit=red+supergiant#p153995Too bad there are only so many red supergiants (though nowhere near as many as main sequence stars or red dwarfs) and the mesh and texture has only been used for a tiny fraction of all the supergiants out there.
Supergiants or hypergiants of any color are apparently unstable (yet diffuse) and can't retain quite a spherical shape like smaller stars do as they're nearing the end of their lives when the helium and stuff is burning.
Yet somehow stars like R136A1 are so massive and dense that they're rendered apparently spherical (although standard Celestia bodies of any class without meshes are really geodesic polyhedrons with resolution increased to such when zoomed in as to appear spherical).
Red supergiant.zip
