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physical object > natural object > celestial body > star > late star > carbon star > C star > N star
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N star comparison table
Subject is a kind of has definition
C starcarbon starLate type giant with strong bands of carbonated molecules (C2, CN, CH) and no metallic oxide bands. Formerly they were called R or N types, the R types being the hotter and the N types the cooler C stars.
N starC starIn the old terminology, the cooler C-type stars.

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