SN 1994I in M51 and the nature of type IBC supernovae
- Additional Document Info
- View All
Early spectra of SN 1994I in M51 (NGC 5194) are presented along with arguments that it is a member of the class of helium-poor Type Ic supernovae. The issue of H and He in the spectra of Type Ib and Ic events is reexamined with the conclusion that Type Ib eject substantially less H than even transition events like SN 1993J and that Type Ic eject substantially less He than Type Ib and their optical spectra are consistent with no H or He. Type Ic show an absorption of the Si n A6355 blend that characterizes Type Ia. This feature requires only a solar abundance of Si. Some Type Ic show an absorption that is probably C II 6580. IR spectra are presented of SN 1990W which show the line of He I 0830. The strength of this feature and the rather slow decay of the late time light curve suggest that this event could be better classified as a Type Ib. Even if trace abundances of H are present in Type Ib and of He in Type Ic the spectral differences still imply a distinctly different evolution for the progenitors of Type Ib from both Type Ic and events like SN 1993J.
The Astrophysical Journal
author list (cited authors)
Wheeler, J. C., Harkness, R. P., Clocchiatti, A., Benetti, S., Brotherton, M. S., Depoy, D. L., & Elias, J.
complete list of authors
Wheeler, JC||Harkness, RP||Clocchiatti, A||Benetti, S||Brotherton, MS||Depoy, DL||Elias, J