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贫金属星进行了光谱观测。从这些数据中，我们可以获得元素合成宇宙早期丰度模式的信息。我们的最终分析还没有完成，但我们可能会透露以下初步结果1。对于[Fe/H]&lt；-2.5的贫金属星，重元素尤其是r元素的散射比观测误差大得多。这些并不是简单的趋势，据推测，这是超级新星爆炸原始大质量恒星的结果。轻元素(Li、Be、B)的丰度有向贫金属星倾斜的趋势，这不适用于前面讨论的早期宇宙中轻元素形成的简单图像。在贫金属星中，发现C、N和O相当丰富。这一事实应该通过积累更多贫金属星的数据来进行调查。对类星体的金属吸收研究导致了对类星体的原始合成的研究，贫金属星应该是有价值的。各种元素的组合。在此基础上，提出了未来斯巴鲁8米望远镜化学高色散谱仪(HDS)宇宙史研究的发展方向。

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.