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| physical object > natural object > celestial body > star > early star > central star of planetary nebula > PG 1159 star |
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| PG 1159 star comparison table | |||
| Subject | is a kind of | has synonym | has definition |
|---|---|---|---|
| central star of planetary nebula | early star | planerary nuclei | |
| PG 1159 star | central star of planetary nebula | pre-degenerate | Very 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. |
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