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首页> 外文期刊>The Astrophysical journal >A Study of H2 Emission in Three Bipolar Proto-Planetary Nebulae: IRAS 16594–4656, Hen 3-401, and Rob 22* **
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A Study of H2 Emission in Three Bipolar Proto-Planetary Nebulae: IRAS 16594–4656, Hen 3-401, and Rob 22* **

机译:对三个双极原行星状星云中H2排放的研究:IRAS 16594-4656,Hen 3-401和Rob 22 * **

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We have carried out a spatial-kinematic study of three proto-planetary nebulae, IRAS 16594–4656, Hen 3-401, and Rob 22. High-resolution H2 images were obtained with NICMOS on the Hubble Space Telescope, and high-resolution spectra were obtained with the Phoenix spectrograph on Gemini-South. IRAS 16594–4656 shows a "peanut-shaped" bipolar structure with H2 emission from the walls and from two pairs of more distant, point-symmetric faint blobs. The velocity structure shows the polar axis to be in the plane of the sky, contrary to the impression given by the more complex visual image and the visibility of the central star, with an ellipsoidal velocity structure. Hen 3-401 shows the H2 emission coming from the walls of the very elongated, open-ended lobes seen in visible light, along with a possible small disk around the star. The bipolar lobes appear to be tilted 10°-15° with respect to the plane of the sky, and their kinematics display a Hubble-like flow. In Rob 22, the H2 appears in the form of an ""-shape, approximately tracing out the similar pattern seen in the visible. H2 is especially seen at the ends of the lobes and at two opposite regions close to the unseen central star. The axis of the lobes is nearly in the plane of the sky. Expansion ages of the lobes are calculated to be ~1600 yr (IRAS 16594–4656), ~1100 yr (Hen 3-401), and ~640 yr (Rob 22), based on approximate distances.
机译:我们已经对三个原行星状星云,IRAS 16594-4656,Hen 3-401和Rob 22进行了空间运动学研究。在哈勃太空望远镜上使用NICMOS获得了高分辨率H2图像。是用双子座南部的凤凰光谱仪获得的。 IRAS 16594–4656显示了一种“花生形”双极结构,它从壁和两对更远的点对称微弱斑点发出H2。速度结构将极轴显示在天空平面中,这与椭圆形速度结构所产生的印象更加复杂,视觉图像和中央恒星的可见度相反。母鸡3-401展示了H2的辐射,它来自可见光中非常细长的,开放式叶瓣的壁,以及可能围绕恒星的小圆盘。双极裂片似乎相对于天空平面倾斜了10°-15°,其运动学表现出类似哈勃的流动。在抢劫案22中,H2以“”形的形式出现,大致描绘出可见的相似图案。 H2特别是在叶的末端和靠近看不见的中央恒星的两个相对区域看到。瓣的轴几乎在天空的平面中。根据近似距离,叶的膨胀年龄经计算为〜1600年(IRAS 16594-4656),〜1100年(Hen 3-401)和〜640年(Rob 22)。

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