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Autor:
Howard E. Bond, Barbara McArthur, Robin Ciardullo, Thomas E. Harrison, G. Fritz Benedict, Hugh C. Harris, Richard J. Patterson, Edmund P. Nelan, Ralf Napiwotzki
Publikováno v:
The Astronomical Journal. 138:1969-1984
We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5. This paper details our reduction and analysis using DeHt 5 as an example. W