Spectroscopic analysis of nearby lower‐main‐sequence stars
Spectroscopic analysis of nearby lower‐main‐sequence stars
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DOI：
10.1111/j.1365-2966.2009.15241.x
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发表时间：
2009-11
影响因子：
4.8
通讯作者：
Xiaowei Wang;J. Shi;Gang Zhao
中科院分区：
文献类型：
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作者：
Xiaowei Wang;J. Shi;Gang Zhao
利用高分辨率、高信噪比的光谱测定了北方天空中30颗邻近的低主序星的O、Na、Mg、Al、Si、K、Ca、Sc、Ti、V、Cr、Fe、Ni和Ba的丰度。与Kotoneva等人的结果相比，我们的结果显示了[Fe/H] I和[Fe/H] II的平衡，并且丰度比作为金属丰度函数的星间散射要小得多。考虑了氧的非局部热力学平衡（non-LTE）校正，发现校正很小（~ -0.04指数）。在整个金属丰度范围内，[O/Fe]呈扁平趋势。讨论了一些重要元素的非lte效应，发现我们计划恒星的丰度模式与F矮星和G矮星非常相似。
Abundances of O, Na, Mg, Al, Si, K, Ca, Sc, Ti, V, Cr, Fe, Ni and Ba are determined for 30 nearby lower-main-sequence stars in the Northern sky using high-resolution, high signal-to-noise ratio spectra. Our results show an equilibrium of [Fe/H] I and [Fe/H] II and a much smaller star-to-star scatter of the abundance ratios as a function of metallicity compared with the results of Kotoneva et al. The non-local thermodynamic equilibrium (non-LTE) corrections for oxygen are considered and found to be small (∼―0.04 dex). A flat trend of [O/Fe] exists over the whole metallicity range. The non-LTE effects for some important elements are discussed, and it is found that the abundance pattern for our programme stars is very similar to that of F and G dwarfs.