消光曲线中尺度结构的详细分析：扩展样本统计与双族分类
A Detailed Analysis of Intermediate-scale Structure in Optical Extinction Curves: Expanded Census and Two-family Classification
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中文总结 AI 辅助
该研究通过分析24颗OB星及50个文献目标的光谱，扩展了星际中尺度结构（ISS）的候选样本，将其分为α、β两族，并发现其可能源于碳质尘埃。
中文摘要 AI 辅助
星际消光曲线的特征是探测星际尘埃的有力工具，可揭示其成分、尺寸分布及塑造它的物理和化学过程的信息。D. Massa等人报道了三个微弱但较宽的消光特征，称为中尺度结构（ISS），位于4370、4870、6300埃处。此后，文献中又报道了三个额外的ISS特征，位于7700、5400、8500埃处，所有这些特征的宽度均大于任何已知的弥散星际带。我们为24颗早型OB星样本提供了新的光学和紫外哈勃空间望远镜/STIS光谱，将这些数据与50个文献目标结合，对ISS特征进行系统、均质的分析，旨在研究其观测行为以帮助限制其载体。该分析又揭示了9个候选ISS特征。我们还发现，根据特征强度之间的相关性，ISS特征可分为两个主要族，我们称之为α族和β族。最后，我们发现2175埃鼓包强度与4353、4847、6443、7710埃处的ISS特征之间存在强相关性，表明它们可能具有碳质起源。
英文摘要
The features of interstellar extinction curves serve as powerful diagnostics for interstellar dust, revealing information about its composition, size distribution, and the physical and chemical processes that shape it. D. Massa et al. reported three faint but wide extinction features, termed intermediate-scale structures (ISS) at 4370, 4870, 6300 Å. Since then, three additional ISS features have been reported in the literature at 7700, 5400, 8500 Å, all with widths greater than any known diffuse interstellar band. We present new optical and UV Hubble Space Telescope/STIS spectra for a sample of 24 early-type OB stars. We used these data combined with 50 literature targets for a systematic, homogeneous analysis of ISS features, with the aim of investigating their observational behavior to help constrain their carriers. This analysis revealed nine more candidate ISS features. We also find that ISS features can be arranged into two main families, which we call $α$ and $β$, according to correlations between the feature strengths. Finally, we find strong correlations between the 2175 Å bump strength and ISS features at 4353, 4847, 6443, 7710 Å, suggesting their possible carbonaceous origin.
