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The Peculiar Planetary Nebula M1-78

Published online by Cambridge University Press:  19 July 2016

S. R. Pottasch ,
A. A. Zijlstra ,
N. Ukita ,
A. Manchado  and
M. Ratag
S. R. Pottasch
Affiliation:
Kaypteyn Astron. Institute, Groningen, the Netherlands
A. A. Zijlstra
Affiliation:
Kaypteyn Astron. Institute, Groningen, the Netherlands NRAO (VLA) Socorro, N.M.
N. Ukita
Affiliation:
Nobeyama Radio Observatory, Japan
A. Manchado
Affiliation:
Inst. Astrofísica de Canarias, Tenerife, Spain
M. Ratag
Affiliation:
Kaypteyn Astron. Institute, Groningen, the Netherlands

Abstract

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The question of whether M1-78 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.

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 216
Copyright
Copyright © Kluwer 1989