The Cassiopeia A Supernova Was of Type IIb

@article{Krause2008TheCA,
  title={The Cassiopeia A Supernova Was of Type IIb},
  author={Oliver Krause and Stephan M. Birkmann and Tomonori Usuda and Takashi Hattori and Miwa Goto and George H. Rieke and Karl Anthony Misselt},
  journal={Science},
  year={2008},
  volume={320},
  pages={1195 - 1197}
}
Cassiopeia A is the youngest supernova remnant known in the Milky Way and a unique laboratory for supernova physics. We present an optical spectrum of the Cassiopeia A supernova near maximum brightness, obtained from observations of a scattered light echo more than three centuries after the direct light of the explosion swept past Earth. The spectrum shows that Cassiopeia A was a type IIb supernova and originated from the collapse of the helium core of a red supergiant that had lost most of its… Expand

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