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arXiv 1504.07514astro-ph.SR
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来自HgMn星HD 175640的STIS-HST光谱的新Mn II能级

New Mn II energy levels from STIS-HST spectrum of the HgMn star HD 175640

F. Castelli, R. L. Kurucz, C. R. Cowley

摘要:

NIST数据库列出了在实验室中观察到但未分类的几条Mn II线。它们不能用于光谱合成,因为它们的原子线数据是未知的。这些线集中在2380-2700 A区间。我们的目的是分配能级和log gf值这些线。由Kurucz计算的Mn II的半经验线数据被用来合成慢旋转的HgMn恒星HD 175640的紫外光谱。将光谱与用HST-STIS设备观察到的高分辨率光谱进行了比较。还检查了覆盖3050-10000 A区域的UVES光谱。我们共确定了73个新的能级,其中58个来自HD 175640的STIS光谱,另外15个来自UVES光谱。新的能级产生了许多新的计算谱线。我们已经确定了NIST数据库中列出的50%以上的未分类线,并改变了另外24条线的分配。对HD 175640恒星的丰度分析,是基于1250-3040 A间隔内观测到的和计算得到的紫外光谱的比较,是对Mn II研究的副产品。

英文摘要:

The NIST database lists several Mn II lines that were observed in the laboratory but not classified. They cannot be used in spectrum synthesis because their atomic line data are unknown. These lines are concentrated in the 2380-2700 A interval. We aimed to assign energy levels and log gf values to these lines. Semi-empirical line data for Mn II computed by Kurucz were used to synthesize the ultraviolet spectrum of the slow-rotating, HgMn star HD 175640. The spectrum was compared with the high-resolution spectrum observed with the HST-STIS equipment. A UVES spectrum covering the 3050-10000 A region was also examined. We determined a total of 73 new energy levels, 58 from the STIS spectrum of HD 175640 and another 15 from the UVES spectrum. The new energy levels give rise to numerous new computed lines. We have identified more than 50% of the unclassified lines listed in the NIST database and have changed the assignement of another 24 lines. An abundance analysis of the star HD 175640, based on the comparison of observed and computed ultraviolet spectra in the 1250-3040 A interval, is the by-product of this study on Mn II.

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