AI 中文总结
本文为热亚矮星光谱分析提供了 As III、Se III、Hf IV 和 Tl IV 的新辐射数据，采用 HFR 和 MCDHF 方法计算并验证振子强度，已应用于实际天体光谱以测定重元素丰度。
AI 中文摘要
定量光谱分析热亚矮星需要双重和三重电离重元素的精确振子强度，但现有数据仍然稀少。我们提出了 As III、Se III、Hf IV 和 Tl IV 的新辐射数据，这些数据采用赝相对论 Hartree-Fock（HFR）方法计算，包括核心极化效应以及对径向参数进行半经验调整以匹配实验能级。此外，还对 As III、Hf IV 和 Tl IV 进行了独立的多组态 Dirac-Hartree-Fock（MCDHF）计算，而对 Se III 则采用了已发表的 MCDHF 数据，以评估 HFR 振子强度的可靠性。两种方法之间的最大差异主要与弱跃迁、强抵消效应或显著的规范不一致有关。对于满足所采用可靠性标准的强跃迁，我们发现两种方法获得的振子强度之间具有良好的一致性。新数据已应用于重金属热亚矮星 LS IV-14$^\circ$116 和 EC 22536-5304 的光谱，使得能够确定 As、Se、Hf 和 Tl 的丰度，并为未来的光谱研究提供了额外的谱线。
英文摘要
Accurate oscillator strengths for doubly and triply ionised heavy elements are required for quantitative spectroscopy of hot subdwarfs, but available data remain sparse. We present new radiative data for As III, Se III, Hf IV and Tl IV, calculated with the pseudo-relativistic Hartree-Fock (HFR) method including core-polarization effects and semi-empirical adjustment of radial parameters to experimental energy levels. Independent multiconfiguration Dirac-Hartree-Fock (MCDHF) computations were also performed for As III, Hf IV and Tl IV, while published MCDHF data were adopted for Se III to assess the reliability of the HFR oscillator strengths. The largest discrepancies between the two approaches are mainly associated with weak transitions, strong cancellation effects, or significant gauge disagreement. For strong transitions satisfying the adopted reliability criteria, we found a good agreement between the oscillator strengths obtained by both methods. The new data have already been applied to the spectra of the heavy-metal hot subdwarfs LS IV-14$^\circ$116 and EC 22536-5304, enabling abundance determinations for As, Se, Hf, and Tl and providing additional lines for future spectroscopic studies.
