symbiotic star
astronomy
Learn about this topic in these articles:
origins of planetary nebula
- In planetary nebula: The nature of the progenitor stars
Symbiotic stars (i.e., stars with characteristics of both cool giants and very hot stars) also are candidates. Novae, stars that brighten temporarily while ejecting a shell explosively, are definitely not candidates; the nova shell is expanding at hundreds of kilometres per second.
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