Using primarily the Hubble Space Telescope we have been identifying the
massive progenitor stars that give rise to core-collapse supernovae, which
is one of the main pursuits of supernova and stellar evolution
studies. Prime examples of this are the Type II-plateau supernovae SN
2003gd in M74 and SN 2005cs in M51. Upper limits on progenitor masses for
both Type II and Type Ib/c supernovae have also been established using HST
image data by us and by other groups. I would summarize this work and what
we know to date.
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