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Glossary term: B 型星

Description: 光谱类型为 "B "的恒星。天文学家通过光谱中出现的中性氦线和氢线来识别 B 型星。它们的典型(有效)温度大约在 10,000 开尔文(K)到 30,000 K之间。与其他恒星相比,它们在人眼中通常呈现蓝白色,除非星际红化或者大气红化不能忽视。B 型星的例子包括狮子座的轩辕十四、猎户座的参宿四和室女座的角宿一。

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

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Related Diagrams


A smooth line declining at longer wavelengths with a few sharp dips.

Spectrum of a B-type star

Caption: The spectrum of the B-type star HD 258982. The colour of the line between 400 nm and 700 nm roughly corresponds to the colour the human eye would see light of that wavelength. Below 400 nm and above 700 nm, where the human eye can see little to no light, the lines are coloured blue and red respectively. The black lines show spectral absorption lines caused by atoms and ions of different elements in the star’s atmosphere. These atoms and ions absorb at specific wavelengths, causing sharp, dark lines in the spectra. How strong these lines are depends on the temperature of the star’s atmosphere. Two stars made from the same mix of elements could have spectra with vastly different sets of lines in their spectra if they have different temperatures in their atmospheres. For B-type stars the most important lines are caused by helium atoms. These lines are strongest in B-type stars and weaker in hotter and cooler types. Lines from hydrogen atoms are also present but are not as strong as in cooler A-type stars.
Credit: IAU OAE/SDSS/Niall Deacon

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