Abundances in planetary nebulae: Hb 5
Abundances in planetary nebulae: Hb 5
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行星状星云的丰度：Hb 5
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
R. Surendiranath
中科院分区：
文献类型：
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作者：
S. Pottasch;R. Surendiranath
本文给出了双叶行星状星云Hb 5的ISO光谱。这些光谱与可见光波长范围内的光谱相结合，以获得完整的消光校正光谱。星云的化学成分可以通过几种方法计算出来。首先，假设所有的离子线都是在电离星星周围的电离区域中形成的，直接计算并相加各个离子的丰度。第二，建立了一个“端到端模型”星云，在这个模型中，我们在电离星云之外包括了一个中性区和一个光离解区。通过这种方式，我们试图解释ISO观察到的分子氢线在一个更自洽的方式。在最后的分析中，该模型被发现基本上是启发式的，但给出了新的见解PDR和PN。这些影响进行了讨论。
The ISO spectra of the bilobal planetary nebula Hb 5 are presented. These spectra are combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition of the nebula is then calculated in several ways. First by directly calculating and adding individual ion abundances, assuming that all the ionic lines are formed in an ionized region surrounding the ionizing star. Secondly by building an “end-to-end model” nebula in which we have included a neutral region and a photodissociation region (PDR) beyond the ionized nebula. In this way we attempt to interpret the molecular hydrogen lines observed by ISO in a more self-consistent way. In the final analysis, the model is found to be basically heuristic, but gives new insights about the PDR and the PN. The implications of these are discussed.