Galactic Distribution, Radial Velocities and Masses of PN

  • Walter J. Maciel
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 131)

Abstract

Since the discovery in 1779 of the first planetary nebula in the Lyra constellation by Antoine Darquier, the total number of objects known as PN has been steadily increasing. About 1600 PN have been identified in the Galaxy, although 10–20% are probably misclassified objects, which include H II regions, reflection nebulae, symbiotic stars, etc. (see for example Kohoutek, 1987; Acker et al., 1987; Stenholm and Acker, 1987).

Keywords

Radial Velocity Galactic Centre Galactic Plane Distance Scale Stellar Evolution 
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.

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Copyright information

© International Astronomical Union 1989

Authors and Affiliations

  • Walter J. Maciel
    • 1
  1. 1.Instituto Astronômico e Geofísico da USPSão PauloBrasil

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