恒星Hα发射线等值宽度的统计分布研究

李 州云
西华师范大学

摘要


Hα发射线是由炽热气体在656.4 nm波长处辐射产生的亮谱线，而吸收线则是由特定波段的光被冷气体吸收时在光谱中形成的暗谱线。本研究基于LAMOST DR9所有的中分辨率光谱数据，系统筛选出具有Hα发射线的恒星样本，并开展统计分析。我们的工作首先是对所有Hα发射线样本进行了等值宽度（EW）计算，统计了不同EW区间的比例分布；同时，结合Gaia EDR3的测光数据，绘制了样本恒星在颜色-星等图上的空间分布，揭示了其演化状态；此外，我们对已有类型的恒星的数量进行了统计，同样绘制在Gaia的颜色星等图上；根据LAMOST中分辨观测的有效温度与表面重力的对数等参数，初步筛选出了一批M、K、G型候选星，为后续研究恒星活动性及演化提供了重要样本。

关键词


Hα发射线；等值宽度；颜色-星等

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参考


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