Observing and Imaging Virtually Unknown Supernova Remnants-Part VIII

Gates, Bill
September 2010
Amateur Astronomy Magazine;Fall2010, Issue 67, p14
The article describes the optical images of several supernova remnants that are invisible without enhancement on the Palomar Observatory Sky Survey. The western section of the optical component of HB 21 in Cygnus shows strong sulfur emission. The remnant G 69.7+1.0 in Cygnus shows an incomplete arc of shell around the bright star HD190430. The G 69.4+2.4 in Cygnus is only about seven feet long but very strong in OIII emission.


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