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| physical object > natural object > celestial body > star > hydrogen-deficient star |
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| hydrogen-deficient star comparison table | ||
| Subject | has spectral type | has definition |
|---|---|---|
| hydrogen-deficient C star | F star, G star | A subgroup of high-luminosity C stars with weak or absent hydrogen lines, mostly of types F and G. |
| hydrogen-deficient early type star | O star, B star or A star | Early type star of type O, B or A in which the hydrogen lines are very weak or absent. |