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首页> 外文期刊>The Astrophysical journal >THE HIGH-EXCITATION PLANETARY NEBULA NGC 246. Ⅱ. FUSE AND CHANDRA OBSERVATIONS
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THE HIGH-EXCITATION PLANETARY NEBULA NGC 246. Ⅱ. FUSE AND CHANDRA OBSERVATIONS

机译：高激发星云NGC246。Ⅱ。保险丝和钱德拉的观察

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摘要

This paper presents Far-Ultraviolet Spectroscopic Explorer (FUSE) medium-resolution slit and Chandra X-Ray Observatory ACIS-S observations of the high-excitation planetary nebula NGC 246. The Ne v λ1146 and [Ne v] λ3426 emission lines, the latter obtained in a previous investigation, indicate that the nebula is photoionized by the intense UV radiation of the central object and has a temperature of ～20,000 K. The O Ⅵ λ1032 and λ1037 emission lines are moderately optically thick and probably contain contributions from both collisional excitation and radiative scattering of the UV continuum of the central star. The Chandra observation did not detect any X-ray emission from the nebula, but did detect the central star. The absence of nebular X-ray emission and the photoionized nature of the nebula support the hypothesis that the nebula contains a biconical cavity, which extends to the edge of the nebula. In this geometry the stellar wind does not shock the nebular material, resulting only in a cool photoionized plasma. The X-ray spectrum of the central object is consistent with NLTE models for PG 1159-type stars.
机译：本文介绍了高激发行星状星云NGC 246的远紫外光谱浏览器（FUSE）中分辨率狭缝和钱德拉X射线天文台ACIS-S观测结果。Nevλ1146和[Ne v]λ3426发射线，后者在先前的研究中获得的结果表明，星云被中心物体强烈的紫外线辐射光电离，温度约为20,000K。OⅥλ1032和λ1037发射线的光学厚度中等，可能包含碰撞激发的贡献以及中央恒星的紫外线连续体的辐射散射。钱德拉（Chandra）的观测没有发现任何来自星云的X射线，但确实发现了中央恒星。不存在星云X射线发射以及星云的光电离特性支持了以下假设：星云包含一个双圆锥形空腔，该空腔延伸到星云的边缘。在这种几何形状中，恒星风不会冲击星云物质，只会产生冷的光电离等离子体。中心物体的X射线光谱与PG 1159型恒星的NLTE模型一致。

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