B[e]超巨星的轴对称模型：I.氢和氦电离结构的有效温度和质量损失依赖性
Axi-symmetric Models of B[e] Supergiants: I. The Effective Temperature and Mass-loss Dependence of the Hydrogen and Helium Ionization Structure
摘要：
我们计算了B[e]包层中的氢和氦电离，并探讨了它们对质量损失和有效温度的依赖性。我们还提出了模拟观测的H α发射线和C IV 1550的双重，并研究它们的行为。本文报道了我们正在进行的B[e]超巨星研究的第一个结果，并在自洽数值模拟中提供了最重要元素电离的一瞥。我们新开发的二维恒星大气程序，ASTAROTH，用于数值模拟。该代码自洽地解决了连续辐射，非LTE水平的人口，和电子温度轴对称恒星信封。观察到的配置文件进行了计算的辅助程序独立开发的ASTAROTH。在我们的所有模型中，除了一个模型之外，H仍然完全电离。由于从激发态电离，得到H中性盘比以前的分析计算要困难得多。在两极附近，电离在所有模型中都很高，而氦在赤道地区重新结合，但我们的质量损失率最低。虽然模型参数没有被调整以提供对任何特定恒星的拟合，但理论轮廓显示了R126轮廓中的一些特征。这些包括部分解析的双峰轮廓的H α，和弱发射与UV C IV共振线。
英文摘要：
We calculate the hydrogen and helium ionization in B[e] envelopes and explore their dependence on mass-loss and effective temperature. We also present simulated observations of the Halpha emission line and the C IV 1550 doublet, and study their behavior. This paper reports our first results in an ongoing study of B[e] supergiants, and provides a glimpse on the ionization of the most important elements in self-consistent numerical simulations. Our newly developed 2D stellar atmosphere code, ASTAROTH, was used for the numerical simulations. The code self-consistently solves for the continuum radiation, non-LTE level populations, and electron temperature in axi-symmetric stellar envelopes. Observed profiles were calculated by an auxiliary program developed separately from ASTAROTH. In all but one of our models, H remained fully ionized. Due to ionizations from excited states it is much more difficult to get a H neutral disk than indicated by previous analytical calculations. Near the poles, the ionization is high in all models, while helium recombined in the equatorial regions for all but our lowest mass-loss rate. Although the model parameters were not adjusted to provide fits to any particular star, the theoretical profiles show some features seen in the profiles of R126. These include the partially resolved double peaked profile of Halpha, and the weak emission associated with the UV C IV resonance line.
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