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The Classification of M 1-78

Published online by Cambridge University Press:  25 April 2016

G. T. Gussie
G. T. Gussie*
Affiliation:
Department of Physics, University of Tasmania, GPO Box 252C, Hobart, Tas. 7001, Australia Grant.Gussie@phys.utas.edu.au
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Abstract

The published properties of M1-78 are discussed with the purpose of resolving the object’s classification as either a planetary nebula or an ultracompact HII region. A classification as a planetary nebula is rejected primarily because of the high luminosity of the object, but because of the chemical composition and expansion velocity of the nebula, a novel classification is proposed instead: that of an ultracompact HII region with a post-main sequence central star (possibly a WN star). It must therefore follow that observable ultracompact HII regions persist beyond the main sequence lifetimes of at least some massive stars, and so cannot be transient phenomena that are seen only during pre-main sequence or early main sequence evolution.

Keywords

ISMHII regions — ISMplanetary nebulae — ISMindividualM 1–78
Type
Gallactic and Stellar
Information
Publications of the Astronomical Society of Australia , Volume 12 , Issue 1 , April 1995 , pp. 31 - 36
Copyright
Copyright © Astronomical Society of Australia 1995

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