HR使用2-D光谱数据和3-D光电离壳模型的Del残端解剖
HR Del remnant anatomy using 2-D spectral data and 3-D photoionization shell models
摘要：
HR Del nova残骸是在Gemini North用IFU-GMOS观测到的。空间分辨光谱数据立方体用于喷出物的运动学、形态学和丰度分析。线图显示了一个非常块状的壳，具有两个主要对称结构。第一个是在H-α中看到的外壳的外部，形成了两个投射在天空平面上的环。这些环状结构对应于封闭的沙漏形状，首先由Harman和O 'Brien（2003）提出。赤道辐射增强是由视线方向上叠加的沙漏结构引起的。第二个结构只在[OIII]和[NII]地图中看到，位于沙漏结构内部的极方向上。在极冠和赤道区之间没有发现丰度梯度，但壳的外部似乎比内部的氧和氮丰度低。详细的2.5D光电离建模的3D壳进行使用的质量分布推断从观察和质量块的存在。由此产生的模型网格被用来约束壳层以及中央电离源的物理特性。一系列的三维cloudies模型，包括一个盘形电离源是能够再现电离梯度之间的两极和赤道地区的壳。不同线上的壳轴比之间的差异也可以用非球面照明来解释。从这些模型中得出的壳体总质量为9 x 10-4 Msun。我们估计，50%至70%的壳质量包含在中性团块中，密度对比高达30倍。
英文摘要：
The HR Del nova remnant was observed with the IFU-GMOS at Gemini North. The spatially resolved spectral data cube was used in the kinematic, morphological and abundance analysis of the ejecta. The line maps show a very clumpy shell with two main symmetric structures. The first one is the outer part of the shell seen in H-alpha, that forms two rings projected in the sky plane. These ring structures correspond to a closed hourglass shape, first proposed by Harman and O'Brien (2003). The equatorial emission enhancement is caused by the superimposed hourglass structures in the line of sight. The second structure seen only in the [OIII] and [NII] maps is located along the polar directions inside the hourglass structure. Abundances gradients between the polar caps and equatorial region were not found. However, the outer part of the shell seems to be less abundant in Oxygen and Nitrogen than the inner regions. Detailed 2.5D photoionization modeling of the 3D shell was performed using the mass distribution inferred from the observations and the presence of mass clumps. The resulting model grids are used to constrain the physical properties of the shell as well as the central ionizing source. A sequence of 3D clumpy models including a disk shaped ionization source is able to reproduce the ionization gradients between polar and equatorial regions of the shell. Differences between shell axial ratios in different lines can also be explained by aspherical illumination. A total shell mass of 9 x 10-4 Msun is derived from these models. We estimate that 50% to 70% of the shell mass is contained in neutral clumps with density contrast up to a factor of 30.
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