O-type star

（重定向自O star）

The Trifid Nebula (M20) is sculpted and lit by the luminous O7.5III star visible at its centre in this infrared image

CNO cycle that powers massive O-type stars

Structure of low-mass, intermediate-mass, and high-mass stars

sdO-type star cross-section showing inert core and helium shell burning

An O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system employed by astronomers. They have temperatures in excess of 30,000 Kelvin (K) and so appear to the left on the Hertzsprung–Russell diagram. Stars of this type are identified by their dominant Helium II absorption lines, strong lines of other ionised elements, and Hydrogen and neutral He lines weaker than spectral type B.

单词	O star
释义	O star 原声例句 Life Noggin Hotter stars are O stars and cooler stars are M stars. 较热的恒星是 O 星，较冷的恒星是 M 星。 Crash Course 天文篇 The hottest are O stars, then B stars which are slightly cooler, down through A, F, G, K, and with the coolest stars being M. 最热的是 O 恒星，然后是温度稍低的B恒星，一直到 A、F、G、K，最冷的恒星是 M。英语百科 O-type star （重定向自O star） An O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system employed by astronomers. They have temperatures in excess of 30,000 Kelvin (K) and so appear to the left on the Hertzsprung–Russell diagram. Stars of this type are identified by their dominant Helium II absorption lines, strong lines of other ionised elements, and Hydrogen and neutral He lines weaker than spectral type B.
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