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Unformatted text preview: hot, blue stars. 8. A star’s radius can be calculated from its luminosity and surface temperature. Giants and supergiant are more luminous than the sun which tells us that they must be much larger in radius than the sun. The hotter stars emit much more light per unit surface area than cooler stars. A supergiant star such as Betelgeuse is 500 solar radii. The Aldebaran giant star is 30 solar radii. Main-sequence stars follow this simple relationship between mass, temperature, and luminosity. They do not hold for giants or supergiant. 9. White dwarfs are the stars near the lower left are smaller in radius and appear white in color because of their high temperatures. 13....
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- Spring '08
- Stellar classification, GIANTS, spectral type, spectral types, basic spectral types