IMPROVED log(gf) VALUES FOR LINES OF Ti i AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937 (ACCURATE TRANSITION PROBABILITIES FOR Ti i)
IMPROVED log(gf) VALUES FOR LINES OF Ti i AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937 (ACCURATE TRANSITION PROBABILITIES FOR Ti i)
复制标题
改进了 Ti i 线的 log(gf) 值以及太阳和贫金属恒星 HD 84937 光层中的丰度测定（Ti i 的精确跃迁概率）
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J. Cowan
中科院分区：
文献类型：
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作者：
J. Lawler;A. Guzman;M. P. Wood;C. Sneden;J. Cowan
本文报道了Ti原子948线跃迁几率的新测量结果。从傅立叶变换光谱和光谱记录使用3米阶梯光谱仪的分支馏分相结合，从激光诱导荧光测量公布的辐射寿命，以确定这些跃迁概率。与NIST原子光谱数据库进行比较，发现总体上一致性良好。新的Ti i数据被应用于重新确定太阳和贫金属星星HD 84937的光球中的Ti丰度，使用许多线覆盖的波长和激发势的范围，以探索可能的非局部热平衡效应。本研究支持早期研究中所观察到的贫金属星中相对Ti/Fe丰度随金属丰度的变化。
New atomic transition probability measurements for 948 lines of Ti i are reported. Branching fractions from Fourier transform spectra and from spectra recorded using a 3 m echelle spectrometer are combined with published radiative lifetimes from laser-induced fluorescence measurements to determine these transition probabilities. Generally good agreement is found in comparisons to the NIST Atomic Spectra Database. The new Ti i data are applied to re-determine the Ti abundance in the photospheres of the Sun and metal-poor star HD 84937 using many lines covering a range of wavelength and excitation potential to explore possible non-local thermal equilibrium effects. The variation of relative Ti/Fe abundance with metallicity in metal-poor stars observed in earlier studies is supported in this study.