Harvard spectral classification of stars

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The Harvard spectral classification of stars is an early 20th-century system that categorizes stars by their spectral characteristics and surface temperatures into types O, B, A, F, G, K, and M, forming the basis of modern stellar classification.

Aliases (2)

Morgan–Keenan classification ×1
Pickering–Fleming system of stellar classification ×1

Referenced by (3)

Subject (surface form when different)	Predicate
Edward Charles Pickering → Edward Charles Pickering ("Pickering–Fleming system of stellar classification") →	notableWork
Hertzsprung–Russell diagram ("Morgan–Keenan classification") →	relatedTo