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Appendix twelve
Spectral Type
| spectral type |
surface temperature (°C) |
examples |
| O |
40000 - 25000 |
|
| B |
25000 - 11000 |
|
Spica (main sequence) |
| Regulus (main sequence) |
|
Rigel (supergiant) |
|
| A |
1100 - 7500 |
| Vega (main sequence) |
| Sirius (main sequence) |
| Deneb (supergiant) |
|
| F |
7500 - 6000 |
| Canopus (supergiant) |
| Procyon (subgiant) |
| Polaris (supergiant) |
|
| G |
6000 - 5000 |
| Sun (main sequence) |
| Alpha Centauri (main sequence) |
| Tau Ceti (main sequence) |
| Capella (giant) |
|
| K |
5000 - 3500 |
| Epsilon Eridani (main sequence) |
| Arcturus (giant) |
| Aldebaran (giant) |
|
| M |
3500 - 3000 |
| Barnard's star (main sequence) |
| Antares (supergiant) |
| Betelgeuse (supergiant) |
|
| Spectral type: a way of classifying stars into
groups according to the nature of their spectrum. The spectral type is a
rough guide to the temperature of the star. In order from hottest to
coolest, the spectral types are lettered as follows: O, B, A, F, G, K, M.
Each spectral type is also subdivided into ten sub-groups from 0 to 9. |
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