List of Spectral Classes for Main Sequence Stars

Related article: spectral class spectral class,
in astronomy, a classification of the stars by their spectrum and luminosity. In 1885, E. C. Pickering began the first extensive attempt to classify the stars spectroscopically.
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Characteristics of Spectral Classes for Main Sequence Stars
Class Color Surface Temperature Strong Lines
O blue-white 35,000°C; ionized helium
B blue-white 21,000°C; helium
A white 10,000°C; hydrogen
F creamy 7,000°C; ionized calcium
G yellow 6,000°C; calcium
K orange 4,500°C; titanium oxide
M red 3,000°C; titanium oxide
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