Excitation and Excavation of the Claws of the Southern Crab

We show that the Southern Crab (aka Hen2-104) presents an auspicious opportunity to study form and speed of invisible winds excavate shock lobes various types bipolar nebulae associated with close highly evolved binary stars. A deep three-color image overlay Hen2-104 reveals ionization state its lobe edges, or "claws", increases steadily from singly doubly ionized values increasing wall latitude. This "reverse" pattern is unique among planetary (and similar objects) incompatible UV photoionization a central source. most self-consistent explanation for by fast (~600 km s^-1) "tapered" stellar wind in which momentum flux increase equatorial present hydrodynamic simulation places latitude-dependent form, knotty walls, reverse outer into unified context.