论文标题
与氢的无弹性碰撞对金属贫困恒星中NLTE铜丰度的影响
The Impact of Inelastic Collisions with Hydrogen on NLTE Copper Abundances in Metal-Poor Stars
论文作者
论文摘要
我们研究了具有更新的模型原子的非本地热力学平衡（NLTE）分析，其中包括Cu \，$+$ \，H和CU $^+$^+$^+$^，$+$+$+$^，H $^ - In eAlastic colutions的量子机械速率系数。 （2021）。这些数据对NLTE丰度确定的影响已经对六个金属贫困的星星进行了$ -2.59 \，DEX $ \，\ le $ \，[fe/h] \，[fe/h] \，$ \ le $ \，$ 0.95 \，dex，dex，dex。对于\ ion {Cu} {1}线，与Drawin的理论近似相比，准确的原子数据的应用导致从LTE和较低的铜丰度的出发下降。为了验证我们采用的铜原子模型，我们还得出了样品星的\ ion {Cu} {2}线的LTE铜丰度。已经获得了\ ion {Cu} {1}（NLTE）和\ ion {Cu} {2}（LTE）线的一致的铜丰度，这表明我们的铜原子模型的可靠性。值得注意的是，当$ \ sim $ \，$ - $ 2.0 \，dex \，$ <$ \，[fe/h] \，$ <$ <$ <$ \，$ \ sim $ \，$ \ sim $ \，$ 1.0 \，dex，dex，dex，dex，tex（Metallicity copper）copper copper copper copper）。
We investigate the non-local thermodynamic equilibrium (NLTE) analysis for \ion{Cu}{1} lines with the updated model atom that includes quantum-mechanical rate coefficients of Cu\,$+$\,H and Cu$^+$\,$+$\,H$^-$ inelastic collisions from the recent study of Belyaev et al. (2021). The influence of these data on NLTE abundance determinations has been performed for six metal-poor stars in a metallicity range of $-$2.59\,dex$\,\le$\,[Fe/H]\,$\le$\,$-$0.95\,dex. For \ion{Cu}{1} lines, the application of accurate atomic data leads to a decrease in the departure from LTE and lower copper abundances compared to that obtained with the Drawin's theoretical approximation. To verify our adopted copper atomic model, we also derived the LTE copper abundances of \ion{Cu}{2} lines for the sample stars. A consistent copper abundance from the \ion{Cu}{1} (NLTE) and \ion{Cu}{2} (LTE) lines has been obtained, which indicates the reliability of our copper atomic model. It is noted that the [Cu/Fe] ratios increase with increasing metallicity when $\sim$\,$-$2.0\,dex\,$<$\,[Fe/H]\,$<$\,$\sim$\,$-$1.0\,dex, favoring a secondary (metallicity-dependent) copper production.
