Motions and Structure of the Filamentary Envelope of the Crab Nebula

  title={Motions and Structure of the Filamentary Envelope of the Crab Nebula},
  author={Virginia Trimble},
  journal={The Astronomical Journal},
  • V. Trimble
  • Published 1 September 1968
  • Physics
  • The Astronomical Journal
Proper motions have been measured for 132 line-emitting filaments in the Crab Nebula on direct plates taken with the 100 and 200-inch telescopes. These motions, if assumed constant and extrapolated backwards in time, converge toward a point about 12" southeast of the double star near the center of the nebula. The filaments approach, on the average, most closely to that point or expansion center in about the year 1140, indicating that the expansion has been somewhat accelerated. Proper motions… 

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Galactic Structure
  • 1966
Galactic Structure, A
  • Publ. Astr. Obs. Pulkova
  • 1966