Single stars classified by their stage of stellar evolution, from red dwarfs through giants and supergiants to variable stars such as Cepheids. Belongs here: any individual star entry that is not itself a member of a named multiple-star system. Does not belong here: two or more gravitationally bound stars catalogued as one system, grouped under Multiple Star Systems, or a stars own remnant after collapse, grouped under Black Holes and Compact Objects.
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Sources
1. Wikipedia: Stellar classification
Wikimedia FoundationStellar classification, History section, 1901 Cannon sentenceQuote, Stellar classification, History section, 1901 Cannon sentence
In 1901, Annie Jump Cannon returned to the lettered types, but dropped all letters except O, B, A, F, G, K, M, and N used in that order, as well as P for planetary nebulae and Q for some peculiar spectra.
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