论文标题
iota她的SI II线的非LTE分析，并具有各种原子数据集
Non-LTE analysis of the Si II lines in iota Her with various atomic data sets
论文作者
论文摘要
这项研究表明，在B3 IV型星iota大气中，Si II的统计平衡对Si II水平的光电离截面变化极为敏感。 Si II吸收线的丰度差异在从两个均等精度来源的数据（即不透明度项目（OP）和NORAD数据库中）平均为0.18 DEX之间。使用氢化近似进行光电化横截面，我们获得了SI II \ EU {4S} {2} {2} {s} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {}的源函数的源函数很高，并从该行中非常相似的源函数，该源的源函数与对应值非常相似（20222222222222222）我们认为，从Si II 6371 A中获得的武田（2022）在iota HE中获得的近距离丰度是由于使用SI II水平的氢化光电离截面。但是，在Iota中观察到的Si II的发射线只能通过OP光电离截面来再现。 SI II水平的光电离截面需要进一步改进。
This study shows that the statistical equilibrium of Si II in the atmosphere of a B3 IV type star iota Her is extremely sensitive to a variation in photoionization cross-sections for the Si II levels. The difference in abundances derived from absorption lines of Si II between applying the data from two equal accuracy sources, namely, the Opacity Project (OP) and the NORAD database, amounts to 0.18 dex, on average. Using the hydrogenic approximation for photoionization cross-sections, we obtain the departure coefficients for the Si II \eu{4s}{2}{S}{}{} level, the source function for Si II 6371 A, and the abundance derived from this line, which are very similar to the corresponding values computed by Takeda (2022). We suppose that close-to-solar abundance obtained by Takeda (2022) from Si II 6371 A in iota Her is due to using the hydrogenic photoionization cross-sections for the Si II levels. However, emission lines of Si II observed in iota Her can only be reproduced with the OP photoionization cross-sections. Photoionization cross-sections for the Si II levels need further improvements.
