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arXiv 0911.5571astro-ph.SR
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行星状星云的形态结构

Morphological Structures of Planetary Nebulae

Sun Kwok

摘要:

由于行星状星云的各种结构成分表现得不同,因此需要结合光学、红外、亚毫米波和射电技术来获得行星状星云的完整图像。投影的影响也会使真实3D结构的推导变得困难。使用一些例子,我们表明,双极和多极星云比通常推断出的行星状星云的表观结构的形态分类更常见。我们提出了一个新的假设,即PN的双极和多极叶不是高密度喷射物质的区域,而是电离和照明的结果。可见的明亮区域实际上是低密度的体积(由高速流出清除),其中UV光子被引导通过。我们认为,具有相似叶大小的多极星云不是由同时向几个方向喷射物质造成的,而是由紫外光子泄漏到这些方向造成的。

英文摘要:

Since various structural components of planetary nebulae manifest themselves differently, a combination of optical, infrared, submm, and radio techniques is needed to derive a complete picture of planetary nebulae. The effects of projection can also make the derivation of the true 3-D structure difficult. Using a number of examples, we show that bipolar and multipolar nebulae are much more common than usually inferred from morphological classifications of apparent structures of planetary nebulae. We put forward a new hypothesis that the bipolar and multipolar lobes of PN are not regions of high-density ejected matter, but the result of ionization and illumination. The visible bright regions are in fact volume of low densities (cleared by high-velocity outflows) where the UV photons are being channelled through. We suggest that multipolar nebulae with similar lobe sizes are not caused by simultaneous ejection of matter in several directions, but by leakage of UV photons into those directions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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