What shape tendency is predicted for PNs originating from progenitors more massive than Sun-like stars in that mass range?
Answer
Highly irregular and bipolar forms.
The characteristics of the progenitor star appear to dictate the resulting geometry of the Planetary Nebula (PN). Stars comparable to our own Sun are generally predicted to yield simpler shapes, such as spherical or slightly elliptical forms, following the shedding of their outer layers. Conversely, progenitors that were more massive, yet still within the range capable of forming PNs, tend to generate the most complex visual outcomes, specifically resulting in highly irregular or distinct bipolar shapes.
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