论文标题
来自原子线的3D非LTE太阳氮丰度
The 3D non-LTE solar nitrogen abundance from atomic lines
论文作者
论文摘要
氮是恒星和银河天文学各个领域的重要元素,太阳氮的丰度对于比较宇宙中的不同物体而言至关重要。 In order to obtain a precise and accurate value for this abundance, we carried out N i line formation calculations in a 3D radiative-hydrodynamic STAGGER model solar atmosphere, in full 3D non-local thermodynamic equilibrium (non-LTE), using a model atom that includes physically-motivated descriptions for the inelastic collisions of N i with free electrons and with neutral hydrogen.我们选择了五个I高激发能量线来详细研究它们的优势以及它们相对没有混合物。我们发现,这些线从非LTE光子损失和3D砂粒效应中略有增强,从而导致负丰度校正分别为$ -0.01 $ DEX和$ -0.04 $ DEX。我们提倡的太阳氮的丰度为$ \logε_ {\ mathrm {n}} = 7.77 $,系统$1σ$不确定性估计为$ 0.05 $ dex。此结果与纠正线选择差异和等效宽度的差异后的早期研究一致。
Nitrogen is an important element in various fields of stellar and Galactic astronomy, and the solar nitrogen abundance is crucial as a yardstick for comparing different objects in the cosmos. In order to obtain a precise and accurate value for this abundance, we carried out N i line formation calculations in a 3D radiative-hydrodynamic STAGGER model solar atmosphere, in full 3D non-local thermodynamic equilibrium (non-LTE), using a model atom that includes physically-motivated descriptions for the inelastic collisions of N i with free electrons and with neutral hydrogen. We selected five N i lines of high excitation energy to study in detail, based on their strengths and on their being relatively free of blends. We found that these lines are slightly strengthened from non-LTE photon losses and from 3D granulation effects, resulting in negative abundance corrections of around $-0.01$ dex and $-0.04$ dex respectively. Our advocated solar nitrogen abundance is $\logε_{\mathrm{N}} = 7.77$, with the systematic $1σ$ uncertainty estimated to be $0.05$ dex. This result is consistent with earlier studies after correcting for differences in line selections and equivalent widths.