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Characteristics of Spectral Classes for Main Sequence Stars
ClassColorSurface TemperatureStrong Lines
Oblue-white35,000°Cionized helium
Bblue-white21,000°Chelium
Awhite10,000°Chydrogen
Fcreamy7,000°Cionized calcium
Gyellow6,000°Ccalcium
Korange4,500°Ctitanium oxide
Mred3,000°Ctitanium oxide
spectral class

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved.

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