A New Study of Some Galactic Planetary Nebulae

  • Stephen J. Meatheringham
  • Peter R. Wood
  • D. J. Faulkner
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 131)

Abstract

Expansion velocities ([O III], [O II], and He II) have been measured for a sample of 64 Southern Planetary Nebulae (PN). The ratio of [O III] to [O II] expansion velocities is used to derive a typical ionized shell thickness of order ΔR/Rneb ≈ 0.12. Nebular electronic densities have been determined from the [O II]λλ3727, 3729 A doublet for 23 of these objects. These data are compared with previously published values. The Dopita et al. (1987) distance scale for Magellanic Cloud PN based on a correlation between observable nebular parameters is used to derive distances to 32 Galactic nebulae. These distances are compared with published values, and lead to the conclusion that the Dopita et al., Daub (1982) and Maciel (1984) distance scales agree well, but that the Shklovsky (1956) method yields distances that are too large. Nebular ionized masses are also calculated for a subset of 30 objects.

Keywords

Emission Line Spectral Type Compact Object Distance Scale Expansion Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© International Astronomical Union 1989

Authors and Affiliations

  • Stephen J. Meatheringham
    • 1
  • Peter R. Wood
    • 1
  • D. J. Faulkner
    • 1
  1. 1.Mount Stromlo and Siding Spring ObservatoriesAustralian National UniversityAustralia

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