Notes
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Type
Color
Approximate Surface Temperature
Main Characteristics
Examples
O
Blue > 25,000 K Singly ionized helium lines either in emission or absorption. Strong ultraviolet continuum. 10 Lacertra
B
Blue 11,000 - 25,000 Neutral helium lines in absorption. Rigel
Spica
A
Blue 7,500 - 11,000 Hydrogen lines at maximum strength for A0 stars, decreasing thereafter. Sirius
Vega
F
Blue to White 6,000 - 7,500 Metallic lines become noticeable. Canopus
Procyon
G
White to Yellow 5,000 - 6,000 Solar-type spectra. Absorption lines of neutral metallic atoms and ions (e.g. once-ionized calcium) grow in strength. Sun
Capella
K
Orange to Red 3,500 - 5,000 Metallic lines dominate. Weak blue continuum. Arcturus
Aldebaran
M
Red < 3,500 Molecular bands of titanium oxide noticeable. Betelgeuse
Antares
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