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physical object > natural object > celestial body > star > early star > central star of planetary nebula
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central star of planetary nebula comparison table
Subject has synonym has definition
PG 1159 starpre-degenerateVery hot star with strong O VI and C IV lines, which is an X-ray emitter. Probably these stars are the central stars of planetary nebulae that have dissipated their envelopes.
ultraviolet starplanerary nucleiVery hot prewhite-dwarf star; usually the hot central star of a planetary nebula which is contracting toward the white-dwarf state.
ultraviolet-bright starplanerary nucleiStar that is brighter than horizontal-branch stars and bluer than giant-branch stars.

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