演化贫金属双星PS Gem的长期高分辨率光谱监测
Long-term high-resolution spectroscopic monitoring of the evolved metal-poor binary PS Gem
浏览论文内容
中文总结 AI 辅助
通过6米BTA望远镜近三十年高分辨率光谱监测，确定演化贫金属双星PS Gem的轨道参数与动力学特性，填补了其长期时域观测的空白。
中文摘要 AI 辅助
我们报告了对极贫金属恒星PS Gem（即HD 52961，与IRAS 07008+1050相关）的长期高分辨率光谱监测结果。这些光谱是使用6米BTA望远镜在1997年至2025年期间以分辨率R=60000获取的，形成了跨越近三十年的均匀数据集。对Hα双峰轮廓的定量测量显示，在多个轨道周期内，峰强比I_V/I_R和吸收线核心速度存在可重复的相位相关变化，而峰间距ΔV_r几乎保持恒定，为78±4 km s⁻¹。日心径向速度测量得出系统速度γ=7.46±0.64 km s⁻¹，轨道半振幅K=2.49 km s⁻¹，在监测期间未观察到显著的长期长期漂移。根据OI 7773埃三重线的等效宽度（W_λ=1.16±0.02 Å）估算的恒星光度对应log(L/L_⊙)≈3.5。弥漫星际带的平均径向速度与PS Gem在本地旋臂中的位置一致。这些观测为该演化贫金属恒星的动力学行为提供了罕见的数十年时域约束。
英文摘要
We present results of long-term high-resolution spectroscopic monitoring of the extremely low-metallicity star PS Gem (=HD 52961), associated with IRAS 07008+1050. The spectra were obtained with the 6-meter BTA telescope at a resolving power of R=60000 during 1997--2025, providing a homogeneous dataset spanning nearly three decades. Quantitative measurements of the H$α$ two-peaked profile reveal repeatable phase-dependent variations of the peak-intensity ratio $I_{\rm V}/I_{\rm R}$ and the absorption-core velocity over multiple orbital cycles, whereas the peak separation remains nearly constant at $ΔV_r = 78\pm 4$ km s$^{-1}$. The heliocentric radial velocity measurements yield a systemic velocity of $γ=7.46\pm 0.64$ km s$^{-1}$ and an orbital semi-amplitude of $K=2.49$ km s$^{-1}$. No significant long-term secular drift is observed over the monitoring interval. The stellar luminosity, estimated from the equivalent width of the OI 7773 Ȧ triplet ($W_λ=1.16\pm$ 0.02 Ȧ), corresponds to $\log(L/L_{\odot})\approx$3.5. The average radial velocity of diffuse interstellar bands is consistent with the location of PS Gem in the Local Arm. These observations provide rare multi-decade time-domain constraints on the dynamical behavior of this evolved metal-poor star.
