大质量发光发射线星LHA 115-S 18中拉曼散射线的发现
Discovery of Raman-scattered lines in the massive luminous emission-line star LHA 115-S 18
摘要：
LHA 115-S 18是一颗非常奇特的发射线恒星，表现出B[e]现象。它位于小麦哲伦星云，光谱显示出非常广泛的激发和电离阶段的特征，从紫外和光学区域的高电离原子线（Si IV，C IV，He II）延伸到光学和红外区域的CO和TiO分子发射带。LHA 115-S 18最显著的光谱特征是在He II λ4686发射线中检测到的高可变性，这可能是一个非常明显或完全不可见的特征。在这项工作中，我们报告的另一个特点LHA 115-S 18。从2000年至2008年拍摄的高分辨率光谱中，我们发现了两个发射特征的出现和加强，分别是λ6825和λ7082，我们将其确定为拉曼散射线。这是第一次在大质量发光B[e]星的光谱中检测到这些谱线。由于LHA 115-S 18的分类是非常有争议的，我们讨论如何在这个特殊的恒星拉曼散射线的外观的发现可能有助于我们解决这个难题。
英文摘要：
LHA 115-S 18 is a very peculiar emission-line star exhibiting the B[e] phenomenon. Located in the Small Magellanic Cloud, its spectrum shows features of an extremely wide range of excitation and ionization stages, extending from highly ionized atomic lines (Si IV, C IV, He II) in the UV and optical regions to molecular emission bands of CO and TiO in the optical and IR regions. The most distinguishing spectral characteristic of LHA 115-S 18 is the high variability detected in the He II λ4686 emission line, which can be a very conspicuous or completely invisible feature. In this work, we report on another peculiarity of LHA 115-S 18. From high-resolution optical spectra taken between 2000 and 2008, we discovered the appearance and strengthening of two emission features at λ6825 Å, and λ7082 Å,, which we identified as Raman-scattered lines. This is the first time these lines have been detected in the spectrum of a massive luminous B[e] star. As the classification of LHA 115-S 18 is highly controversial, we discuss how the discovery of the appearance of Raman-scattered lines in this peculiar star might help us to solve this puzzle.
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