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Glossary term: B 型星

Description: 光譜類型為 "B "的恆星。天文學家通過光譜中出現的中性氦線和氫線來識別 B 型星。它們的典型(有效)溫度大約在 10,000 開爾文(K)到 30,000 K之間。與其他恆星相比,它們在人眼中通常呈現藍白色,除非星際紅化或者大氣紅化不能忽視。B 型星的例子包括獅子座的軒轅十四、獵戶座的參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
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This is an automated transliteration of the simplified Chinese translation of this term

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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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