Hubble Space Telescope Measurements of the Expansion of NGC 6543: Parallax Distance and Nebular Evolution

  title={Hubble Space Telescope Measurements of the Expansion of NGC 6543: Parallax Distance and Nebular Evolution},
  author={Darren S. Reed and Bruce Balick and Arsen R. Hajian and Tracy L. Klayton and Stefano Giovanardi and Stefano Casertano and Nino Panagia and Yervant Terzian},
  journal={The Astronomical Journal},
  pages={2430 - 2441}
The optical expansion parallax of NGC 6543 has been detected and measured using two epochs of Hubble Space Telescope images separated by a time baseline of only 3 years. We have utilized three separate methods of deriving the angular expansion of bright fiducials, with excellent agreement in the results. We combine our angular expansion estimates with spectroscopically obtained expansion velocities to derive a distance to NGC 6543 of 1001 ± 269 pc. The deduced kinematic age of the inner bright… 
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