Catalog of Chromium, Cobalt, and Nickel Abundances in Globular Clusters and Dwarf Galaxies
Catalog of Chromium, Cobalt, and Nickel Abundances in Globular Clusters and Dwarf Galaxies
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球状星团和矮星系中铬、钴和镍丰度目录
DOI：
10.3847/1538-4365/aac952
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
M. Bergemann
中科院分区：
文献类型：
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作者：
E. Kirby;Justin L. Xie;Rachel Guo;M. Kovalev;M. Bergemann
我们目前的测量铬，钴，镍的丰度在4113红巨星，包括2277颗恒星的球状星团（GC），1820颗恒星在银河系的矮卫星星系，和16场星。我们测量了大多数档案凯克/DEIMOS中分辨率光谱的丰度，分辨率为R 6500，波长范围约为6500-9000 nm。通过拟合包含所考虑元素的吸收线的光谱区域来确定丰度。我们使用了我们以前从相同光谱中确定的温度，表面重力和金属丰度的估计。我们通过检查单金属GC内丰度的分散来估计系统误差。[Cr/Fe]、[Co/Fe]和[Ni/Fe]的中值不确定度分别为0.20、0.20和0.13。最后，我们通过重复测量验证了我们对不确定性的估计，并通过与相同恒星的高分辨率光谱测量进行比较，评估了我们测量的准确性和精密度。
We present measurements of the abundances of chromium, cobalt, and nickel in 4113 red giants, including 2277 stars in globular clusters (GCs), 1820 stars in the Milky Way’s dwarf satellite galaxies, and 16 field stars. We measured the abundances from mostly archival Keck/DEIMOS medium-resolution spectroscopy with a resolving power of R ∼ 6500 and a wavelength range of approximately 6500–9000 Å. The abundances were determined by fitting spectral regions that contain absorption lines of the elements under consideration. We used estimates of temperature, surface gravity, and metallicity that we previously determined from the same spectra. We estimated systematic error by examining the dispersion of abundances within mono-metallic GCs. The median uncertainties for [Cr/Fe], [Co/Fe], and [Ni/Fe] are 0.20, 0.20, and 0.13, respectively. Finally, we validated our estimations of uncertainty through duplicate measurements, and we evaluated the accuracy and precision of our measurements through comparison to high-resolution spectroscopic measurements of the same stars.