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14- More supernovae (Type IIb/Ibc (Wolf-Rayet stars? (massive stars that…
14- More supernovae
Type IIb/Ibc
Progenitors must have been stripped or almost stripped, of their hydrogen envelopes (in case of Ic also helium)
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Wolf-Rayet stars?
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very luminous, so non-detetction of projenitor for several nearby SNe pretty much rules them out as usual progenitors
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observations of CCSNe
Massive stars
so expected to be in star forming regions, not elliptical galaxies, S0 galaxies, spiral galaxies bulges
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type 1b/c also associated with star formation, but don't have string hydrogen
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not sharp distiction, IIb seems to be intermediate
Type II-P
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Plateau caused, as visible photosphere at ~5000K migrates backwards through expanding envelope as density decreases
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Candidates have mass around 8 Msun, so this mass star can produce normal CCSNe
apparently not ECSN, or ECSN explosion stronger than expected
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SN 1993J in M81
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Progenitor identified in HST imaging from photometry apparently binary consisting of stripped K supergiant with OB supergiant companion
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