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首页> 外文期刊>The Astrophysical journal >C II ABUNDANCES IN EARLY-TYPE STARS: SOLUTION TO A NOTORIOUS NON-LTE PROBLEM
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C II ABUNDANCES IN EARLY-TYPE STARS: SOLUTION TO A NOTORIOUS NON-LTE PROBLEM

机译：C II早期型恒星的丰度：一个众所周知的非LTE问题的解决方案

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摘要

We address a long-standing discrepancy between non-LTE analyses of the prominent C II 4267 and 6578/82 A multiplets in early-type stars. A comprehensive non-LTE model atom of C II is constructed based on critically selected atomic data. This model atom is used for an abundance study of six apparently slow-rotating main-sequence and giant early B-type stars. High-resolution and high S/N spectra allow us to derive highly consistent abundances not only from the classical features but also from up to 18 additional C II lines in the visual—including two so far unreported emission features equally well reproduced in non-LTE. These results require the stellar atmospheric parameters to be determined with care. A homogeneous (slightly) subsolar present-day carbon abundance from young stars in the solar vicinity (in associations and in the field) of log (C/H) + 12 = 8.29 ± 0.03 is indicated.
机译：我们解决了早期类型恒星中突出的C II 4267和6578/82 A多重峰的非LTE分析之间的长期差异。基于严格选择的原子数据构建了C II的综合非LTE模型原子。该模型原子用于对六个表面缓慢旋转的主序列和巨型B型早期恒星的丰度研究。高分辨率和高S / N光谱使我们不仅可以从古典特征中获得高度一致的丰度，而且还可以从视觉中的多达18条附加的C II线中获得高度一致的丰度，其中包括迄今为止在非LTE中同样可以很好再现的两个未报告的发射特征。这些结果需要仔细确定恒星大气参数。指示了太阳附近（联合体和野外）年轻恒星的均一（略微）近日太阳现今碳丰度，其log（C / H）+ 12 = 8.29±0.03。

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