arXiv 2108.130132021-08-30astro-ph.GA

行星状星云的原子数据和密度结构

Atomic data and the density structures of planetary nebulae

Leticia Juan de Dios, Mónica Rodríguez

备注：: 9 pages, 6 figures, 2 table. Accepted for publication in MNRAS
DOI：: 10.1093/mnras/stab2488

摘要：

我们研究了行星状星云的密度结构，这些密度结构是由星云内不同区域的四种采样诊断所暗示的：[S II] $\lambda6716/\lambda6731$，[O II] $\lambda3726/\lambda3729$，[Cl III] $\lambda5518/\lambda5538$和[Ar IV] $\lambda4711/\lambda4740$。我们使用了46个具有深光谱的物体的样本，可以从这四个诊断中计算电子密度，并探索不同原子数据对结果的影响。我们比较了观测结果与从三种不同密度结构的光电离模型得到的结果。我们的结论是，在电子密度的计算中使用的原子数据完全确定的密度结构，导出的对象。我们通过选择原子数据的三种组合来说明这一点，这些组合导致与模型探索的三种不同密度结构中的每一种都兼容的观测结果。

英文摘要：

We study the density structures of planetary nebulae implied by four diagnostics that sample different regions within the nebulae: [S II] $\lambda6716/\lambda6731$, [O II] $\lambda3726/\lambda3729$, [Cl III] $\lambda5518/\lambda5538$, and [Ar IV] $\lambda4711/\lambda4740$. We use a sample of 46 objects with deep spectra that allow the calculation of the electron density from these four diagnostics, and explore the impact that different atomic data have on the results. We compare the observational results with those obtained from photoionization models characterized by three different density structures. We conclude that the atomic data used in the calculations of electron density fully determine the density structures that are derived for the objects. We illustrate this by selecting three combinations of atomic data that lead to observational results that are compatible with each of the three different density structures explored with the models.

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