The conditions for formation of helium lines in the disk and magnetospheric winds of Herbig Ae stars are studied. The program package CLOUDY is used to solve this problem. It is shown that the optical thickness of the gas in the HeI 10830 A line needed to explain the observed P Cyg profiles is reached in the disk or magnetospheric winds of Herbig Ae stars for Te ≥ 10000 K. Here the x-ray emission produced at the surface and in the vicinity of a young star is the main ionization source for helium atoms.

中文翻译：

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年轻 Herbig Ae 星盘和磁层风中氦 HeI 10830 Å 线的形成条件

研究了 Herbig Ae 星盘中氦线的形成条件和磁层风。程序包 CLOUDY 就是用来解决这个问题的。结果表明，HeI 10830 A 线中气体的光学厚度需要解释观测到的 P Cyg 轮廓，在 Herbig Ae 星的圆盘或磁层风中达到 Te ≥ 10000 K。 这里产生的 X 射线发射在年轻恒星的表面和附近是氦原子的主要电离源。