Carbon monoxide emission from planetary nebulae and their possible precursors

A number of planetary and protoplanetary nebulae have been searched for J = 1-0 CO emission. The protoplanetaries generally show very weak (C-13)O emission and the resultant ((C-12)O) /((C-13)O) values are consistent with post-main sequence evolution. No (C-12)O was found in four planetary nebulae,...

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Veröffentlicht in:	Astrophys. J.; (United States) 1983-08, Vol.271 (2), p.611-617
Hauptverfasser:	THRONSON, H. A. JR, MOZURKEWICH, D
Format:	Artikel
Sprache:	eng
Schlagworte:	640105 - Astrophysics & Cosmology- Galaxies ABUNDANCE Astronomy CARBON 12 CARBON 13 CARBON COMPOUNDS CARBON ISOTOPES CARBON MONOXIDE CARBON OXIDES CHALCOGENIDES CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Earth, ocean, space EMISSION ENERGY-LEVEL TRANSITIONS EVEN-EVEN NUCLEI EVEN-ODD NUCLEI Exact sciences and technology ISOTOPE RATIO ISOTOPES LIGHT NUCLEI NEBULAE NUCLEI OXIDES OXYGEN COMPOUNDS PLANETARY NEBULAE Quasars. Active or peculiar galaxies, objects, and systems SPECTRA STABLE ISOTOPES Stellar systems. Galactic and extragalactic objects and systems. The universe
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Beschreibung
Zusammenfassung:	A number of planetary and protoplanetary nebulae have been searched for J = 1-0 CO emission. The protoplanetaries generally show very weak (C-13)O emission and the resultant ((C-12)O) /((C-13)O) values are consistent with post-main sequence evolution. No (C-12)O was found in four planetary nebulae, and it is argued that the high mass loss rate in NGC 7027 explains its relatively strong millimeter wave emission.
ISSN:	0004-637X 1538-4357
DOI:	10.1086/161228