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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-ph2000
The Properties of Hypernovae: SNe Ic 1998bw, 1997ef, and SN IIn 1997cy
K. Nomoto, P. A. Mazzali, T. Nakamura +6
We discuss the properties of the hyper-energetic Type Ic supernovae (SNe Ic) 1998bw and 1997ef and Type IIn supernova (SN IIn) 1997cy. SNe Ic 1998bw and 1997ef are characterized by…