Description: 光谱类型为 "M" 的恒星。天文学家通过光谱中是否存在分子吸收带（主要来自钛氧化物）来识别 M 型星。它们的典型（有效）温度大约在 2500 K 到 3700 K 之间。与其他恒星相比，它们在人眼中呈现红色。光谱类型为 M 的主序星被称为红矮星。M型星也可以是红巨星或红超巨星；这些类型的恒星大多是 M 型星，但也包括一些 K 型星以及一些具有强烈的碳光谱特征的更奇特的恒星类型。猎户座的参宿四就是一颗 M 型超巨星。

Related Terms:

• Main Sequence
• Molecule
• Red Dwarf
• 红巨星
• Red Supergiant
• 光谱类型
• 光谱
• 红化
• 有效温度
• 光度等级

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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