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An imaging and spectroscopic survey of the Abell Planetary Nebulae
Published online by Cambridge University Press: 25 May 2016
Extract
The Abell catalogue of planetary nebulae (PN) are distinguished by their large size, low surface brightness and generally faint central stars. They are thought to be old PN approaching the White Dwarf cooling track. A number have evidence for late thermal pulses (H-poor ejecta near the central star, e.g. A78) and binary central stars.
- Type
- IV. Envelopes
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- Copyright © Kluwer 1997