论文标题
行星星云PB 1和PC 19的形态和电离特征
Morphology and ionization characteristics of planetary nebulae PB 1 and PC 19
论文作者
论文摘要
我们介绍了我们对两个行星星云（PNE），PB1和PC 19的研究结果。我们使用在2 M喜马拉雅chandra望远镜下观察到的这两个PNE的光谱，以及该研究的档案和文献数据。我们使用形态学代码形状来构建PNE的3D形态和光电代码Cloudy来对观察到的光谱进行建模。 PB 1的3D模型由一个伸长的壳包围，该壳被双极光环包围，PC 19的壳由开放裂片的双极结构和一个螺旋丝状对组成。我们通过得出几个血浆参数和光电离模型来分析PNE的电离结构。我们从我们的分析中估计了元素，c，n，o，ne，s，ar和cl的元素丰度。我们发现，在PB 1的情况下，他，C和N的丰度明显更高。我们估计中心星的不同物理参数，即有效的温度，光度和重力，以及星云，即氢密度曲线，半径等，从光电离心建模中。我们估计PB 1的$ \ sim $ 4.3 kpc $ \ sim $ 4.3 kpc，$ \ sim $ \ sim $ 5.6 kpc for PC 19通过将光电离模型拟合到绝对观察到的通量中。祖细胞质量是从理论进化轨迹估算的，被发现为$ \ sim $ 1.67和$ \ sim $ 2.38 $ m _ {\ odot} $用于PB 1和PC 19。
We present results of our study of two planetary nebulae (PNe), PB1 and PC 19. We use the optical spectra of these two PNe observed at 2 m Himalayan Chandra Telescope and also archival and literature data for the study. We use the morphokinematic code SHAPE to construct 3D morphologies of the PNe and the photoionization code CLOUDY to model the observed spectra. The 3D model of PB 1 consists of an elongated shell surrounded by a bipolar halo and that of PC 19 consists of an open lobed bipolar structure and a spiral filamentary pair. We analyze the ionization structure of the PNe by deriving several plasma parameters and by photoionization modelling. We estimate the elemental abundances of the the elements, He, C, N, O, Ne, S, Ar, and Cl, from our analysis. We find He, C and N abundances to be significantly higher in case of PB 1. We estimate different physical parameters of the central stars, namely effective temperature, luminosity and gravity, and of the nebula, namely hydrogen density profiles, radii, etc., from photoionization modelling. We estimate distances to the PNe as $\sim$4.3 kpc for PB 1 and as $\sim$5.6 kpc for PC 19 by fitting the photoionization models to absolute observed fluxes. Progenitor masses are estimated from theoretical evolutionary trajectories and are found to be $\sim$1.67 and $\sim$2.38 $M_{\odot}$ for PB 1 and PC 19, respectively.
