论文标题
彗星21p/giacobini-zinner的高分辨率光谱观测在其2018年幻影中
High-resolution optical spectroscopic observations of comet 21P/Giacobini-Zinner in Its 2018 apparition
论文作者
论文摘要
从粉尘晶粒的化学和物理特性的角度来看，彗星21p/giacobini-zinner是一种奇特的彗星。我们对彗星进行光学高分辨率光谱观测。禁止氧管线（557.7、630.0和636.4 nm）的强度比（h $ _2 $ _2 $ o $^+$）（h $ _2 $ o $^+$）和Amidogen激进分子（nh $ _2 $）的高度nh $ n/$ n/n/n $ n/an自由基受到限制。 H $ _2 $ o $^+$和NH $ _2 $的OPR与其他彗星的OPR相似，尽管这些OPR的真正含义仍在争论中。根据对氧原子禁止的发射线的观察，可以得出结论，彗星以Co $ _2 $耗尽。考虑到在近红外区域发现的其他高挥发性物种的耗竭以及在彗星21p/giacobini-Zinner中存在复杂有机物的存在，与其他彗星相比，该彗星可能在太阳星云的温暖区域中形成。
Comet 21P/Giacobini-Zinner is a peculiar comet from the viewpoints of the chemical and physical properties of its dust grains. We conduct optical high-resolution spectroscopic observations of the comet. The intensity ratios of forbidden oxygen lines (at 557.7, 630.0, and 636.4 nm) and ortho-to-para abundance ratios (OPRs) of water cations (H$_2$O$^+$) and amidogen radicals (NH$_2$) are obtained while only the upper limit for $^{14}$N/$^{15}$N in the amidogen radical is restricted. The OPRs of H$_2$O$^+$ and NH$_2$ are similar to those of other comets, although the real meaning of these OPRs is still debated. Based on the observation of the forbidden emission lines of oxygen atoms, it can be concluded that the comet is depleted in CO$_2$. In consideration with the depletion in other highly volatile species found in the near-infrared region and the presence of complex organics in comet 21P/Giacobini-Zinner, this comet might form in a warmer region in the solar nebula compared with other comets.
