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The Peculiar Planetary Nebula M1-78

  • S. R. Pottasch
  • A. A. Zijlstra
  • N. Ukita
  • A. Manchado
  • M. Ratag
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 131)

Abstract

The question of whether Ml-78 is a PN or a compact H II region is discussed. We have obtained new high resolution radio continuum maps, optical spectra and CO maps. Arguments for it being a PN include spectral information, far infrared continuum emission, and radio morphology. It is the strongest CO emitting PN known. Its abundances are peculiar: high helium and very low oxygen and nitrogen abundances. If it is a PN it must be within 4 kpc, but 21-cm absorption measurements indicate that it may be further away.

Keywords

Massive Star Stellar Evolution Planetary Nebula Radio Observatory Nitrogen Abundance 
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

  • S. R. Pottasch
    • 1
  • A. A. Zijlstra
    • 1
    • 2
  • N. Ukita
    • 3
  • A. Manchado
    • 4
  • M. Ratag
    • 1
  1. 1.Kaypteyn Astron. InstituteGroningenThe Netherlands
  2. 2.NRAO (VLA)SocorroUSA
  3. 3.Nobeyama Radio ObservatoryJapan
  4. 4.Inst. Astrofísica de CanariasTenerifeSpain

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