The physical conditions of celestial objects can be analyzed using the spectrum of atoms or molecules present in the object. The present work focuses on the spectroscopic analysis of astrophysically significant molecule AlF. The evaluation of Franck-Condon (FC) factors and -centroids is done by a numerical integration procedure using the suitable potential energy curves for , , , and band systems of AlF molecule. The intensity of various bands is discussed with the help of derived FC factors. The band degradation and the nature of potential energy curves are studied using -centroid values. The vibrational temperature of sunspot is estimated to be around 1220 ± 130 K which falls in the reported temperature range of cold sunspots.

中文翻译：

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利用AlF分子参数评估黑子的有效温度

可以使用物体中存在的原子或分子的光谱来分析天体的物理条件。目前的工作集中在对天体上具有重要意义的分子AlF的光谱分析。的弗兰克-康登（FC）的因素和评价-centroids由数值积分方法，使用合适的势能曲线完成，，，和的AlF分子的频带系统。借助导出的FC因子讨论了各个频段的强度。使用-质心值研究带的降解和势能曲线的性质。黑子的振动温度估计在1220±130 K左右，这属于报道的寒冷黑子的温度范围。