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Date and Time of the Query: 2019-06-19 T19:16:27 PDT
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For refcode 1996AJ....111.1660S:
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1996AJ....111.1660S ON THE EARLY SPECTROSCOPIC DISTINCTION OF TYPE II SUPERNOVAE ERIC M. SCHLEGEL Code 668, NASA-GSFC, Greenbelt, Maryland 20771 Received 1995 September 1; revised 1995 December 19 ABSTRACT This paper considers the possible spectroscopic differences between two subtypes of Type II supernovae (those supernovae with hydrogen in their spectra): the Linears (II-P), which show a linear decline in their light curves, and the Plateaus (II-P), which show a plateau phase in their light curve. The early phases of evolution of the two supernovae are described as well as clues from the literature that indicate, usually indirectly, the physical nature of the spectroscopic differences. A hypothesis is suggested that the early spectroscopic differences at H{alpha} are the spectroscopic differences between these two subtypes, and that the lack of a strong P Cyg profile at H{alpha} predicts a linear light curve.
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