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arXiv 1009.5876astro-ph.GA
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行星状星云NGC 40和2D_NEB的物理化学光谱制图,一种研究电离星云的新的2D算法

Physico-chemical spectroscopic mapping of the planetary nebula NGC 40 and the 2D_NEB, a new 2D algorithm to study ionised nebulae

M. L. Leal-Ferreira, D. R. Gonçalves, H. Monteiro, J. W. Richards

摘要:

在本文中,我们提出了一个分析的物理和化学条件的行星状星云NGC 40通过空间分辨光谱图。我们还介绍了一种新的算法-2D_NEB-的基础上,完善的IRAF星云包,这是开发,使使用光谱图,以方便地估计电离星云的天体物理量。2D_NEB进行了基准测试,我们清楚地表明它工作正常,因为它与IRAF星云软件进行了很好的比较。利用该软件,我们得到了NGC 40的几个物理参数图。从这些图中,我们得出结论,Te[NII]在不同地区之间只显示出轻微的温度变化,其值限制在~ 8,000 K和~ 9,500 K之间。另一方面,电子密度的空间变化要显著得多,因为Ne[SII]的值在~ 1,000 cm^(-3)~~ 3,000 cm^(-3)之间变化。化学丰度图也显示出显著的差异。从我们工作的大局来看,我们强烈建议空间分辨率的分析是强制性的,以便更全面地研究行星状星云的物理和化学性质。

英文摘要:

In this paper we present an analysis of the physical and chemical conditions of the planetary nebula NGC 40 through spatially-resolved spectroscopic maps. We also introduce a new algorithm --2D_NEB-- based on the well-established IRAF nebular package, which was developed to enable the use of the spectroscopic maps to easily estimate the astrophysical quantities of ionised nebulae. The 2D_NEB was benchmarked, and we clearly show that it works properly, since it compares nicely with the IRAF nebular software. Using this software, we derive the maps of several physical parameters of NGC 40. From these maps, we conclude that Te[NII] shows only a slight temperature variation from region to region, with its values constrained between ~8,000 K and ~9,500 K. Electron densities, on the other hand, have a much more prominent spatial variation, as Ne[SII] values vary from ~1,000 cm^(-3) to ~3,000 cm^(-3). Maps of the chemical abundances also show significant variations. From the big picture of our work, we strongly suggest that analysis with spatial resolution be mandatory for more complete study of the physical and chemical properties of planetary nebulae.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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