演化晚期恒星中的结晶硅酸盐尘埃

发布时间：2018-07-06 16:53

本文选题：演化晚期恒星 + 尘埃　；参考：《天文学进展》2014年02期

【摘要】：硅酸盐是宇宙尘埃的主要成分之一。20世纪60年代,在演化晚期恒星中就曾发现硅酸盐尘埃的辐射特征,并且与实验室无定形硅酸盐的光谱特征非常吻合。到20世纪90年代,演化晚期恒星中的结晶硅酸盐特征首次在ISO卫星拍摄的光谱中探测到,其后随着更多的红外空间天文台(Spitzer、Herschel等)的发射,发现了大量具有结晶硅酸盐特征的恒星,尤其是演化晚期恒星,几乎涵盖了演化晚期的各个阶段(红巨星、渐近巨星支星、原行星状星云、行星状星云、红超巨星等)。结晶硅酸盐尘埃的特征广泛分布在10～70μm波长范围内,表现为多个丰富的谱带。阐述了演化晚期恒星中结晶硅酸盐尘埃的发现、谱特征、观测特性、结晶度和形成机制。
[Abstract]:Silicate is one of the main components of cosmic dust. In the 1960s, the radiation characteristics of silicate dust have been found in the late evolutionary stars, which are in good agreement with the spectral characteristics of laboratory amorphous silicate. By the 1990s, crystalline silicate features in late evolutionary stars were first detected in the spectra taken by ISO satellites, and subsequently launched as more infrared space observatories (Spitzerer Herschel et al.), A large number of stars with the characteristics of crystalline silicate have been found, especially in the late stage of evolution, covering almost every stage of the late evolution (red giant, asymptotic giant star, protoplanetary nebula, red supergiant, etc.). The characteristics of crystalline silicate dust are widely distributed in the wavelength range of 1070 渭 m, showing a number of rich spectral bands. The discovery, spectral characteristics, observational characteristics, crystallinity and formation mechanism of crystalline silicate dust in late evolving stars are described.
【作者单位】：北京师范大学天文系;
【基金】：国家自然科学基金(11373015)
【分类号】：P152

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