SOFTWARE FOR THE ANALYSIS OF EMISSION LINE NEBULAE
SOFTWARE FOR THE ANALYSIS OF EMISSION LINE NEBULAE
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DOI：
10.1086/133637
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发表时间：
1995-09
影响因子：
3.5
通讯作者：
R. Shaw;R. Dufour
中科院分区：
文献类型：
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作者：
R. Shaw;R. Dufour
已经为 IRAF/STSDAS 环境开发了一套软件工具，以在给定适当的诊断发射线比率的情况下导出低密度（星云）气体的物理条件；以及给定适当的发射线通量、电子温度 (Te) 和密度 (Ne) 的连发射率。该软件包基于 De Robertis、Dufour 和 Hunt (1987) 开发的五级程序，但它包括对更多离子和发射线集的诊断，尤其是现在可观测到的卫星紫外线中的离子和发射线。其中两个应用利用 3 区星云模型在不同的低电离、中电离和高电离区中同时导出 Te 和 N3。这些应用程序对于直接从传统的诊断线比率计算星云密度和温度非常有用，可以为更复杂的物理模型提供一些合理的输入参数，或者在一些简化的假设内计算离子丰度（或其他量）。给出了这些诊断对真实星云的实用性示例。
A set of software tools has been developed for the IRAF/STSDAS environment to derive the physical conditions in a low-density (nebular) gas given appropriate diagnostic emission line ratios; and lien emissivities given appropriate emission line fluxes, the electron temperature (Te) and density (Ne). The package is based on the five-level program developed by De Robertis, Dufour and Hunt (1987), but it includes diagnostics from a greater set of ions and emission lines, most particularly those in the satellite ultraviolet that are now observable. Two fo the applications make use of a 3-zone nebular model to derive Te and N3 simultaneously in separate zones of low-, and intermediate-, and high-ionization. These applications are useful for calculating nebular densities and temperatures directly from the traditional diagnostic line ratios, either to provide some reasonable input parameters for a more complicated physical model, or to calculate ionic abundances (or other quantities) within some simplifying assumptions. Examples of the utility of these diagnostics for real nebulae are presented.