an extremely bright star of very large diameter and low density
Supergiants are among the most massive and most luminous stars. They occupy the top region of the Hertzsprung?Russell diagram with bolometric absolute magnitudes between ?5 and ?12 and temperatures from about 3,500K to over 20,000K.
例句与用法
1.
Supergiant molecular cloud sgmc 超巨分子云
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Post red - supergiant 红超巨后星
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A typical red supergiant could be about 100 times larger than the red giant . its surface temperature is low while the total luminosity remains high , with absolute magnitude up to - 10 comparing to 4 . 8 of our sun 典型的超红巨星比普通红巨星大上100倍，虽然表面温度低，但整体光度仍然非常高，绝对星等可达- 10太阳的绝对星等只有4 . 8 。
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