引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 19次   下载 46 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Are Fulleranes Responsible for the 21 Micron Feature?
Yong Zhang*1,2
1.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, China;2.Laboratory for Space Research, Faculty of Science, The University of Hong Kong, Hong Kong, China
Abstract:
Recent detections of C60, C70, and C60+ in space induced extensive studies of fullerene derivatives in circumstellar environments. As the promising fullerene sources, protoplanetary nebulae (PPNe) shows a number of unidentified bands in their infrared spectra, among which a small sample exhibits an enigmatic feature at ∽21 μm. Hydrogenation converts fullerenes into fulleranes, which breaks the symmetry of fullerene molecules and produces new infrared bands. In this work, we investigate the possibility of fulleranes (C60Hm) as the carrier of the 21 μm feature in terms of theoretical vibrational spectra of fulleranes. The evidences favoring and disfavoring the fullerane hypothesis are presented. We made an initial guess for the hydrogen coverage of C60Hm that may contribute to the 21 μm feature.
Key words:  Fulleranes, Infrared, Asymptotic giant branch and post-asymptotic giant branch, Circumstellar matter, Stars
FundProject:
氢化富勒烯能否解释天文光谱中的21 μm辐射特征?
张 泳*1,2
1.中山大学物理与天文学院,珠海 519082;2.香港大学太空研究实验室,香港
摘要:
目前在天文环境中探测到了C60、C70、C60+,极大地刺激了对星周包层中富勒烯衍生物的研究. 原行星状星云是富勒烯在天文环境下的可能形成源,其红外光谱中具有丰富的、还未能认证的特征谱带,其中在21 μm处的一条谱带尤为神秘. 当富勒烯被氢化,分子的对称性被破坏,能够激活新的红外振动谱,这有可能部分解释天文光谱中的红外谱带. 本文对氢化富勒烯的理论振动谱进行研究,考查了氢化富勒烯能否作为21 μm辐射的载体,详细讨论了各种支持和反对的证据,并且推测了可能贡献21 μm特征的氢化富勒烯的氢化程度.
关键词:  氢化富勒烯,红外,渐近巨星支和后渐近巨星支,星周物质,恒星
DOI:10.1063/1674-0068/cjcp1911203
分类号: