2 papers
astro-ph2000
The tetra-lobed planetary nebula NGC 1501
Franco Sabbadin, Stefano Benetti, Enrico Cappellaro +1
Direct imagery and long-slit, spatially resolved echellograms of the high excitation planetary nebula NGC 1501 allowed us to study in detail the expansion velocity field, the physi…
astro-ph1999
Tomography of the low excitation planetary nebula NGC 40
F. Sabbadin, E. Cappellaro, S. Benetti +2
Spatially resolved, long-slit echellograms at different position angles of the bright, low excitation planetary nebula NGC 40 indicate that, the higher is the gas excitation, the f…