太阳中钪的NLTE研究
NLTE study of scandium in the Sun
摘要：
本文研究了中性和单离化钪谱线在太阳光球中的形成。这项研究的目的是推导出钪线的太阳$\log gfε_{\odot}$（Sc）值，这将用于贫金属星的差异丰度分析。对模型原子进行了广泛的统计平衡计算，其中包括92项\ion{Sc}{i}和79项\ion{Sc}{ii}。光电离截面被假定为类氢。根据NLTE离差系数计算的合成线轮廓与观测到的太阳光谱图谱进行了比较。考虑了超精细结构（HFS）展宽。钪的统计平衡由缺失强线引起的\ion{Sc}{i}的强种群不足主导。它几乎不受相互作用参数变化的影响，对太阳大气模型的选择仅略微敏感。使用ODF模型进行的粗略测定导致太阳Sc丰度在$\logε_\odot = 3.07$和3.13之间，这取决于$f$值的选择。光球和陨石钪丰度之间的长期已知的差异被证实的实验$f$ -值。
英文摘要：
We investigate the formation of neutral and singly ionized scandium lines in the solar photospheres. The research is aimed derive solar $\log gfε_{\odot}$(Sc) values for scandium lines, which will later be used in differential abundance analyses of metal-poor stars. Extensive statistical equilibrium calculations were carried out for a model atom, which comprises 92 terms for \ion{Sc}{i} and 79 for \ion{Sc}{ii}. Photoionization cross-sections are assumed to be hydrogenic. Synthetic line profiles calculated from the level populations according to the NLTE departure coefficients were compared with the observed solar spectral atlas. Hyperfine structure (HFS) broadening is taken into account. The statistical equilibrium of scandium is dominated by a strong underpopulation of \ion{Sc}{i} caused by missing strong lines. It is nearly unaffected by the variation in interaction parameters and only marginally sensitive to the choice of the solar atmospheric model. Abundance determinations using the ODF model lead to a solar Sc abundance of between $\logε_\odot = 3.07$ and 3.13, depending on the choice of $f$ values. The long known difference between photospheric and meteoritic scandium abundances is confirmed for the experimental $f$-values.
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