Stellar Classes

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O-Type

O-Type star
O-Type star (STSC)

O-Type star (STSC)
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Color Dark Blue[1]
Temperature 28,000-50,000K
Composition Ionized atoms, especially helium
Example Mintaka (O1-3III)

B-Type

B-Type star
B-Type star (STSC)

B-Type star (STSC)
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Color Blue[1]
Temperature 10,000-28,000K
Composition Neutral helium, some hydrogen
Example Alpha Eridani A (B3V-IV)

A-Type

A-Type star
A-Type star (STSC)

A-Type star (STSC)
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Color Light Blue[1]
Temperature 7,500-10,000K
Composition Strong hydrogen, some ionized metals
Example Sirius A (A0-1V)

F-Type

F-Type star
F-Type star (STSC)

F-Type star (STSC)
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Color White[1]
Temperature 6,000-7,500K
Composition Hydrogen and ionized metals, calcium and iron
Example Procyon A (F5V-IV)

G-Type

G-Type star
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Color Yellow[1]
Temperature 5,000-6,000K
Composition Ionized calcium, both neutral and ionized metals
Example Sol (G2V)

K-Type

K-Type star
K-Type star (STSC)

K-Type star (STSC)
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Color Orange[1]
Temperature 3,500-5,000K
Composition Neutral metals
Example Alpha Centauri B (K0-3V)

M-Type

M-Type star
M-Type star (STSC)

M-Type star (STSC)
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Color Red[1]
Temperature 2,500-3,500K
Composition Ionized atoms, especially helium
Example Wolf 359 (M5-8V)

Notes and References