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physical object > natural object > celestial body > star > emission line star > H and K emission line star

H and K emission line star comparison table

Subject	is a kind of	has definition	has spectral type
emission line star	star
late star	star	Star with spectral type later than the sun (G2).	cooler than G2
H and K emission line star	emission line star	Late objects (F4 to M), which exhibit emission features in their Ca II HK lines.	cooler than G2

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