Cylindrical Planetary Nebulae. I. Flow from an Irradiated Ring
Many bipolar nebulae with a pronounced cylindrical shape, such as Henize 3-401, show no indication whatsoever of interaction between a disk and a stellar wind, or a jet on the nebular axis.I propose that the disk that is observed at the base of the bipolar is itself the source of the outflow.In particular, I assume that irradiation from the sara st