同位素分裂对太阳Ca II 854.2 nm谱线平分线和反转的影响
The effect of isotopic splitting on the bisector and inversions of the solar Ca II 854.2 nm line
摘要：
Ca II 854.2 nm谱线是太阳色球层的常见特征。平均线轮廓显示出不对称的芯，并且其平分线显示出特征性的倒C形状。这条线实际上由六种成分组成，根据钙的同位素不同，波长略有不同。这种同位素分裂在非太阳恒星的研究中已经被考虑在内，但从未在太阳中被考虑过。我们进行了非LTE的辐射转移计算从三个模型的太阳大气，并表明，不对称的线芯和反C形的平分线的854.2 nm线可以解释同位素分裂。我们证实了这一发现，通过分析观测结果，并表明，线不对称性是存在的，无论在太阳大气中的条件。最后，我们表明，反演的基础上钙II 854.2 nm线应考虑同位素分裂，否则推断的大气将包含错误的速度梯度和温度。
英文摘要：
The Ca II 854.2 nm spectral line is a common diagnostic of the solar chromosphere. The average line profile shows an asymmetric core, and its bisector shows a characteristic inverse-C shape. The line actually consists of six components with slightly different wavelengths depending on the isotope of calcium. This isotopic splitting of the line has been taken into account in studies of non-solar stars, but never for the Sun. We performed non-LTE radiative transfer computations from three models of the solar atmosphere and show that the asymmetric line-core and inverse C-shape of the bisector of the 854.2 nm line can be explained by isotopic splitting. We confirm this finding by analysing observations and showing that the line asymmetry is present irrespective of conditions in the solar atmosphere. Finally, we show that inversions based on the Ca II 854.2 nm line should take the isotopic splitting into account, otherwise the inferred atmospheres will contain erroneous velocity gradients and temperatures.
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