Decipherment of Cosmic History with Spectroscopy

在这个项目中，我们用英澳天文台、凯克天文台和北京天文台的各种望远镜对缺金属星进行了光谱观测。从这些数据中，我们可以得到宇宙早期元素合成的丰度模式信息。我们的最终分析尚未完成，但我们可以透露以下初步结果。对于[Fe/H] <-2.5的贫金属星，重元素，特别是r元素的散射比观测误差大。这些不是简单的趋势，据推测，这些是原始大质量恒星的超新星爆炸的结果。轻元素（Li、Be和B）的吸收有向贫金属星方向发展的趋势，这不适合于前面讨论的早期宇宙轻元素形成的简单图景.在贫金属星中，发现C、N和O相当丰富。这一事实应通过积累更多贫金属恒星的数据来调查。类星体的金属吸收研究引发了类星体原初合成的研究，贫金属星的研究具有重要的价值。各种元素。对类星体和贫金属星的比较研究是有价值的，在此基础上，我们提出了Subaru 8 m望远镜化学高色散谱仪（HDS）未来宇宙史研究的方向。

In this project, we performed spectroscopic observations of metal deficient stars with various telescopes of Anglo-Australian Observatory, Keck observatory, and Beijing Observatory. From these data, we can get the information on abundance pattern in the cosmic early phase of elemental synthesis. Our final analysis has not been completed yet, but we may reveal the following preliminary results.1. For the metal poor stars with [Fe/H] <-2.5, the heavy elements, in particular, r-elements have a large scatter more than observational errors. These are not simple trends, and it is speculated that these are the results from the Super Novae explosions of primordial massive stars.2. Abundance of light elements (Li, Be, and B) can be seen to have a trend towards metal poor stars, which is not suitable for a simple picture of formation of light elements in early universe discussed previously.3. In the metal poor stars, it is found that C,N, and O are rather abundant. This fact should be investigated by accumulating data for more metal poor stars.4. Metal absorption study of QSO has led to the study of primordial synthesis of QSO and metal poor stars should be valuable. Of various elements. Comparative study of QSO and metal poor stars should be valuable.On the basis of these results, we have proposed the future study of cosmic history of chemical High Dispersion Spectrograph (HDS) of Subaru 8m Telescope.