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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2005.00903astro-ph.SRastro-ph.GA
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年轻行星状星云中CH $^{+}$、CH和H $_2$分子的探测IC 4997

Detection of CH$^{+}$, CH and H$_2$ molecules in the Young Planetary Nebula IC 4997

N. Kameswara Rao, David L. Lambert, Arumalla B. S. Reddy, D. A. García-Hernández, Arturo Manchado, J. J. Díaz-Luis

摘要:

我们从年轻致密行星状星云IC 4997的高分辨光谱中探测到CH $^{+}$和CH分子吸收线。高分辨率红外(H和K波段)光谱提供了H $_2$发射线以及许多其他线的检测。H $_2$线提供了2100 K的激发温度,这可能是由于包层中的紫外荧光或恒星位于AGB上时电离气体膨胀流出与喷射的中性包层之间的界面处形成的冲击造成的。提出CH $^+$可能是吸热反应C + H $_2$ $\rightarrow$ CH $^+$ + H的产物。有趣的是,CH $^{+}$和CH显示出比H $_{\rm 2}$发射更高的膨胀速度,这表明它们可能是冲击后气体的一部分。

英文摘要:

We have detected CH$^{+}$ and CH molecular absorption lines from the young compact planetary nebula IC 4997 from high resolution optical spectra. A high-resolution infra-red (H and K bands) spectrum provides detection of H$_2$ emission lines amongst many other lines. The H$_2$ lines provide an excitation temperature of 2100 K which may result from UV fluorescence in the envelope or from shocks formed at the interface between an expanding outflow of ionized gas and the neutral envelope ejected when the star was on the AGB. It is suggested that the CH$^+$ may result from the endothermic reaction C + H$_2$ $\rightarrow$ CH$^+$ + H. Intriguingly, CH$^{+}$ and also CH show a higher expansion velocity than H$_{\rm 2}$ emission suggesting they may be part of the post-shocked gas.

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