Cometary grain scattering versus wavelength, or 'What color is comet dust'?
Cometary grain scattering versus wavelength, or 'What color is comet dust'?
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彗星颗粒散射与波长的关系，或者“彗星尘埃是什么颜色”？
DOI：
10.1086/164745
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
K. Meech
中科院分区：
文献类型：
--
作者：
D. Jewitt;K. Meech
彗星的光学和近红外观测结合在一起，系统地研究了彗星颗粒散射的波长依赖性。彗星颗粒反射率相对于观测波长的归一化变化率随着波长的增加而减小。观察到的反射率梯度的波长依赖性与来自微米级或更大的、稍微吸收的球体散射的起源是一致的。光学上重要的彗星颗粒大约比光学上重要的星际颗粒大一个数量级。这种大小差异很可能是彗星凝聚形成的星云中颗粒生长的结果。彗星的颗粒性质差别如此之大，以至于任何相角或日心距离对连续体颜色的依赖都被隐藏了。42引用。
Optical and near-infrared observations of comets are combined in a systematic study of the wavelength dependence of the scattering from cometary grains. The normalized rate of change of the reflectivity of cometary grains with respect to the wavelength of observations decreases as the wavelength increases. The observed wavelength dependence of the reflectivity gradient is consistent with an origin by scattering from micron-sized or larger, slightly absorbing spheres. The optically important comet grains are about an order of magnitude larger than the optically important interstellar grains. This size difference is a probable result of grain growth in the cloud from which the comets condensed. Grain properties differ so widely among the comets that any phase angle or heliocentric distance dependences of the continuum color are hidden. 42 references.