Stellar Classes
From Trekipedia
O-Type
O-Type star (STSC)
| Temperature | 28,000-50,000°K |
| Composition | Ionized atoms, especially helium |
| Example | Mintaka (O1-3III) |
B-Type
B-Type star (STSC)
| Temperature | 10,000-28,000°K |
| Composition | Neutral helium, some hydrogen |
| Example | Alpha Eridani A (B3V-IV) |
A-Type
A-Type star (STSC)
| Temperature | 7,500-10,000°K |
| Composition | Strong hydrogen, some ionized metals |
| Example | Sirius A (A0-1V) |
F-Type
F-Type star (STSC)
| Temperature | 6,000-7,500°K |
| Composition | Hydrogen and ionized metals, calcium and iron |
| Example | Procyon A (F5V-IV) |
G-Type
| Temperature | 5,000-6,000°K |
| Composition | Ionized calcium, both neutral and ionized metals |
| Example | Sol (G2V) |
K-Type
K-Type star (STSC)
| Temperature | 3,500-5,000°K |
| Composition | Neutral metals |
| Example | Alpha Centauri B (K0-3V) |
M-Type
M-Type star (STSC)
| Temperature | 2,500-3,500°K |
| Composition | Ionized atoms, especially helium |
| Example | Wolf 359 (M5-8V) |
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