Spectral Classes for Main Sequence Stars ( (table))

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Spectral Classes for Main Sequence Stars

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