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| physical object > natural object > celestial body > star > early star > white dwarf > DO white dwarf | 
| DO white dwarf comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| white dwarf | early star | Faint very-compact stars at the end of their life. Also used as convenient photometric and flux standards. | 
| DO white dwarf | white dwarf | both He and H lines present | 
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