论文标题
IPHASE来源的详细研究-I。双极后期IPHASS j193718.6+202102
Detailed studies of IPHAS sources -- I. The disrupted late bipolar IPHASX J193718.6+202102
论文作者
论文摘要
我们对新的行星星云（PN）IPHASTX J193718.6+202102进行了详细分析，该分析是使用深层成像和中间和高分辨率光谱学通过形态型和光电离世模型来解释的。星云的物理结构由碎片的圆环和极度微弱的正交双极流出组成，这与其光学图像所暗示的捏腰pn形态相反。我们的运动学分析表明，圆环在25 $ \ pm $ 5 km s $^{ - 1} $中膨胀，并且正在逐渐分解。在估计的7.1 $ _ { - 0.3}^{+0.8} $ kpc时，相应的运动年龄为$ \ sim $ 26000年$ 26000年与微弱且分解的PN一致。中间分辨率光谱揭示了激发的PN，具有II型PNE典型的化学丰度。基于后者，我们还估计了2--3 m $ _ {\ odot} $的祖细胞的初始质量和中央星（CSPN）质量$ M_ \ Mathrm {CSPN} \ SIM $ 0.61 M $ _ $ _ $ _ {\ odot} $。 Spitzer MIPS 24 $μ$ m的排放紧随碎片的圆环可以归因于[O IV]在25.9 $μ$ m下的发射，而不是尘埃发射。所有结果都一致地指向溶解在星际培养基中的边缘上进化的中等巨大的双极II型PN。
We present a detailed analysis of the new planetary nebula (PN) IPHASX J193718.6+202102 using deep imaging and intermediate- and high resolution spectroscopy that are interpreted through morpho-kinematic and photoionisation modelling. The physical structure of the nebula consists of a fragmented torus and an extremely faint orthogonal bipolar outflow, contrary to the pinched waist PN morphology suggested by its optical image. Our kinematic analysis indicates that the torus is expanding at 25$\pm$5 km s$^{-1}$ and is gradually breaking up. At an estimated distance of 7.1$_{-0.3}^{+0.8}$ kpc, the corresponding kinematic age of $\sim$26000 years is consistent with a faint and disintegrating PN. The intermediate-resolution spectra reveal an excited PN with chemical abundances typical of Type II PNe. Based on the latter we also estimate an initial mass for the progenitor in the range 2--3 M$_{\odot}$ and a central star (CSPN) mass $M_\mathrm{CSPN}\sim$0.61 M$_{\odot}$. The Spitzer MIPS 24 $μ$m emission that closely follows the fragmented torus could be attributed to the emission of [O IV] at 25.9 $μ$m rather than to dust emission. All the results coherently point towards an evolved moderately massive bipolar Type II PN on the brink of dissolving into the interstellar medium.
