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What Does It Mean to be a “Depleted” Comet? High Spectral Resolution Observations of the Prototypical Depleted Comet 21P/Giacobini–Zinner from the McDonald Observatory
The Planetary Science Journal ( IF 3.8 ) Pub Date : 2020-12-04 , DOI: 10.3847/psj/abb471
Anita L. Cochran 1 , Tyler Nelson 2 , Adam J. McKay 3, 4
Affiliation  

We present high spectral resolution optical observations of comet 21P/Giacobini–Zinner from six nights in 2018. The observations were obtained with the Tull Coud Spectrograph on the 2.7 m Harlan J. Smith Telescope of the McDonald Observatory. This comet’s spectrum shows strong depletions in C2, C3, CH, and NH2 relative to CN. We explore what it means for a comet to be depleted and show that all of the species are present in the spectrum at similar relative line intensities within a a molecular band compared with a typical comet. The depletions represent a much lower abundance of the species studied.



中文翻译:

成为“耗尽”彗星意味着什么?麦当劳天文台对原型贫乏彗星21P / Giacobini-Zinner的高光谱分辨率观测

我们将在2018年的六个晚上提供21P / Giacobini-Zinner彗星的高光谱分辨率光学观测结果。这些观测结果是通过麦当劳天文台2.7 m的哈兰·史密斯望远镜的Tull Coud光谱仪获得的。该彗星的光谱显示相对于CN而言,C 2,C 3,CH和NH 2的强烈消耗。我们探索了彗星被耗尽的含义,并表明与典型的彗星相比,所有物种在一个分子带内以相似的相对线强度出现在光谱中。耗竭表明所研究物种的丰度要低得多。

更新日期:2020-12-04
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