Infrared Mn i laboratory oscillator strengths for the study of late type stars and ultracool dwarfs
Infrared Mn i laboratory oscillator strengths for the study of late type stars and ultracool dwarfs
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红外 Mn i 实验室振荡器在晚型恒星和超冷矮星研究中的优势
DOI：
10.1051/0004-6361/201015006
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发表时间：
2010
影响因子：
6.5
通讯作者：
Blackwell-Whitehead R
中科院分区：
文献类型：
--
作者：
Blackwell-Whitehead R
目的我们新实验室测量的目的是测量研究晚型恒星和超冷矮星所需的红外中性锰跃迁的精确绝对振荡器强度。方法通过高分辨率傅里叶变换光谱测量了分支分数，并与文献中的辐射能级寿命相结合，得出振荡器强度。结果我们提出了波长范围 3216 到 20 Mn i 跃迁的实验振荡器强度。 13 997 Å，其中 15 个位于红外区域。 12 899 Å 和 12 975 Å 处的跃迁在晚型恒星和超冷矮星的光谱中被观察到是一个强烈的特征。我们已将计算出的光谱与晚型恒星光谱中观测到的 Mn i 谱线进行了拟合。使用新的实验测量的 Mn i log (gf) 值以及 Mn i 超精细结构分裂因子的现有数据，我们确定太阳大气中的锰丰度为 logN(Mn) = −6.65 ± 0.05，大角星大气中的 logN(Mn) = 6.95 ± 0.20，并且logN(Mn) = −6.70 ± 0.20 在 M 9.5 矮星 2MASSW 0140026+270150 的大气中。
AimsThe aim of our new laboratory measurements is to measure accurate absolute oscillator strengths for neutral manganese transitions in the infrared needed for the study of late-type stars and ultracool dwarfs.MethodsBranching fractions have been measured by high resolution Fourier transform spectroscopy and combined with radiative level lifetimes in the literature to yield oscillator strengths.ResultsWe present experimental oscillator strengths for 20 Mn i transitions in the wavelength range 3216 to 13 997 Å, 15 of which are in the infrared. The transitions at 12 899 Å and 12 975 Å are observed as strong features in the spectra of late-type stars and ultracool dwarfs. We have fitted our calculated spectra to the observed Mn i lines in spectra of late-type stars. Using the new experimentally measured Mn i log (gf) values together with existing data for Mn i hyperfine structure splitting factors we determined the manganese abundance to be logN(Mn) = −6.65 ± 0.05 in the atmosphere of the Sun, logN(Mn) = 6.95 ± 0.20 in the atmosphere of Arcturus, and logN(Mn) = −6.70 ± 0.20 in the atmosphere of M 9.5 dwarf 2MASSW 0140026+270150.