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… 

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A Subsolar Metallicity Progenitor for Cassiopeia A, the Remnant of a Type IIb Supernova

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X-ray studies of supernova remnants: A different view of supernova explosions

  • C. Badenes
  • Physics
    Proceedings of the National Academy of Sciences
  • 2010
The most relevant results on supernova remnants obtained during the first decade of Chandra and the impact that these results have had on open issues in supernova research are reviewed.
...

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