描述: 原恒星是恒星形成过程的早期阶段。它是星际介质中巨大分子云收缩后形成的大量气体和尘埃。随着分子云的坍缩，引力势能转化为热能，使仍在形成中的原恒星升温。这一阶段可能需要 10⁵ 到 10⁷ 年，具体时间取决于恒星的质量，质量越大的恒星形成得越快。这个过程始于分子云核心密度的增加，终于前主序星的形成。质量与太阳相近的前主序星被称为金牛座T型恒星（T-Tauri）。一旦恒星内的氢聚变被点燃，它就开始产生能量，成为主序星。

相关词条

• 主序
• 恒星形成
• 星际介质
• 分子云

词条和定义状态： 该术语的英文原始定义已通过天文研究人员和教师的审核
该术语及其定义的译文仍待审核

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