Cosmic Evolution through Stellar Spectroscopy

我的研究重点是通过光谱丰度分析研究恒星系统的化学演化。这项研究的一个主要目的是了解最早时期星系的演化和丰富，以及提高我们对元素起源的理解。这个提议描述了在我们自己的和附近的矮星系中进行这类工作的几个相关途径。具体目标（金属贫乏的恒星，化学奇特的恒星，矮星系中潮汐半径以外的恒星）的详细光谱可以解决元素的起源和星际介质的均匀性问题，以及恒星风和超新星反馈对星系演化的影响，以及合并对低质量系统化学演化的影响。在过去的十年里，这个领域已经产生了重大的影响，然而我们才刚刚开始有足够的数据来比较附近的矮星系，并收集更孤立的矮不规则星系的数据。银河系中心是另一个有趣的区域，在那里还没有发现大量缺乏金属的恒星，然而数值模拟表明，第一颗恒星是在大质量晕的引力中心附近点燃的，是不含金属的大质量恒星。我们已经启动了一项计划，利用光度法和光谱学技术在银河系凸起区寻找缺乏金属的恒星——其中一项技术将包括首次使用斯巴鲁乌鸦多目标自适应光学原型。在接下来的十年中，我们将看到大型光谱调查的增加，而许多正在计划中，如Subaru-PFS和NOAO-DESI，一些高分辨率的研究目前正在执行中，如SDSS III-APOGEE和ESO-GAIA调查。通过公开发布，这些数据集（以及来自赫歇尔和ALMA的其他数据集）可以用来解决从银河考古学到碎片盘形成的各种问题。我的研究计划包括几个项目，是理想的HQP培训的学生和pdf。

My research is centered on the chemical evolution of stellar systems via spectroscopic abundance analyses. A major aim of this is to understand the evolution and enrichment of galaxies from the earliest epochs, as well as improving our understanding of the origins of the elements. This proposal describes several related avenues of such work, in our own and in nearby dwarf galaxies. Detailed spectroscopy of specific targets (metal-poor stars, chemically peculiar stars, stars beyond the tidal radii in dwarf galaxies) can address questions of the origins of the elements and the homogeneity of the interstellar medium, as well as the effects of stellar winds and supernova feedback on galaxy evolution, and the impact of mergers on the chemical evolution of low mass systems. This field has had a significant impact in the past decade, and yet we are only beginning to have sufficient data to compare the nearby dwarf galaxies to one another, and to collect data for the more isolated dwarf irregular galaxies. The Galactic Centre is another interesting region where metal-poor stars have yet to be found in significant numbers, and yet numerical simulations suggest that First Stars ignite as metal-free, massive stars near the gravitational centres of massive halos. We have initiated a program to search for metal-poor stars in the Galactic Bulge using both photometry and spectroscopic techniques – one of these will include first light use of the Subaru-RAVEN multi-object adaptive optics prototype. The next decade will see an increase in large spectroscopic surveys, and while many are being planned, such as Subaru-PFS and NOAO-DESI, some high resolution studies are currently being executed, such as SDSS III-APOGEE and the ESO-GAIA survey. Through public releases, these datasets (and others such as from Herschel and ALMA) can be used to address questions ranging from Galactic Archaeology to the formation of debris disks. My research proposal includes several projects that are ideal for HQP training of students and PDFs.