早期碳星HD 100764不寻常的碳氢化合物排放：芳烃和芳烃之间的联系
The unusual hydrocarbon emission from the early carbon star HD 100764: The connection between aromatics and aliphatics
摘要：
我们使用斯皮策太空望远镜上的红外光谱仪（IRS）获得了HD 100764的光谱，HD 100764是一颗明显的单颗碳星，具有星周盘。光谱显示多环芳烃（PAH）的发射特征，这些多环芳烃被转移到比通常看到的更长的波长，作为Peeters等人分类方案中的"C类"系统的特征。所有七个已知的C类PAH源都被辐射场照射，这些辐射场比通常激发PAH发射特征的辐射场更冷。所观察到的波长偏移与含有芳香族和脂肪族键的烃混合物是一致的。我们建议，C类PAH光谱是独特的，因为碳质材料没有受到强紫外辐射场，允许相对脆弱的脂肪族材料生存。
英文摘要：
We have used the Infrared Spectrograph (IRS) on the Spitzer Space Telescope to obtain spectra of HD 100764, an apparently single carbon star with a circumstellar disk. The spectrum shows emission features from polycyclic aromatic hydrocarbons (PAHs) that are shifted to longer wavelengths than normally seen, as characteristic of ``class C'' systems in the classification scheme of Peeters et al. All seven of the known class C PAH sources are illuminated by radiation fields that are cooler than those which typically excite PAH emission features. The observed wavelength shifts are consistent with hydrocarbon mixtures containing both aromatic and aliphatic bonds. We propose that the class C PAH spectra are distinctive because the carbonaceous material has not been subjected to a strong ultraviolet radiation field, allowing relatively fragile aliphatic materials to survive.
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