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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

一顆 B 型恒星的光譜

Caption: B 型恒星 HD 258982 的光譜。波長在 400 納米到 700 納米之間的光譜綫的顔色大緻與人眼看到的該波長光綫的顔色一緻。波長低於 400 納米和高於 700 納米時,人眼幾乎看不到光,光譜綫的顔色分彆為藍色和紅色。 黑綫錶示恒星大氣中不同元素的原子和離子造成的光譜吸收綫。這些原子和離子會吸收特定波長的光,從而在光譜中形成尖銳的暗綫。這些綫條的強度取決於恒星大氣層的溫度。如果兩顆恒星的大氣層溫度不同,那麼由相同元素混閤而成的兩顆恒星的光譜中可能會齣現大相徑庭的光譜綫。對於 B 型恒星來說,最重要的譜綫是由氦原子産生的。這些譜綫在 B 型恒星中最強,在較熱和較冷的類型中較弱。氫原子産生的譜綫也存在,但不如在較冷的 A 型恒星中那麼強。
Credit: IAU OAE/SDSS/Niall Deacon

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