| 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 |
Spectral Classes for Main Sequence Stars
| Columbia Encyclopedia: Spectral Classes for Main Sequence Stars |
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