The spectroscopic diversity of type II supernovae. M. Turatto, S. Benetti, E. Cappellaro, I.J. Danziger, P.A. Mazzali. This paper highlights the differences in the spectroscopic behavior observed within the extended family of Type II supernovae.
Reference is made to both early and late phases and to the variations in light curves.
Both previously published data and new observations are used to illustrate the diversity of behavior. The possible roles of differing progenitor configurations are discussed along with the part played by circumstellar material in the form of a gentle or superwind. Although much remains to be clarified concerning progenitors and their evolutionary state, the diversity can probably be at least qualitatively understood within the framework of the parameters mentioned above.