Cosmic Evolution through Stellar Spectroscopy

通过恒星光谱观察宇宙演化

• 批准号: RGPIN-2014-06054
• 负责人: Venn, Kimberley
• 金额: $ 2.62万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=667712
• 关键词: Cosmic; Evolution; through; Stellar; Spectroscopy

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.

我的研究以光谱丰度分析为中心于恒星系统的化学演化。这样做的主要目的是了解最早时代的星系的演变和丰富，并提高我们对元素起源的理解。该提案描述了我们本身和附近的矮星系中的几种相关途径。特定目标的详细光谱（金属贫困星，化学奇特的恒星，矮星系中的潮汐半径之外的星星）可以解决元素起源的问题以及星际介质的同质性以及恒星风和恒星风的影响超新星对星系进化的反馈以及合并对低质量系统化学演化的影响。 在过去的十年中，该领域产生了重大影响，但是我们才开始拥有足够的数据来将附近的矮星系相互比较，并为更孤立的矮人不规则的星系收集数据。银河系中心是另一个有趣的区域，在该区域中尚未发现金属贫困的恒星，但数值模拟表明，第一颗恒星在大型晕孔的重力中心附近被点燃为无金属，巨大的恒星。我们已经启动了一个程序，使用光度法和光谱技术搜索银河系凸起中的金属贫困恒星 - 其中之一将包括首次使用Subaru-raven多对象自适应光学原型。在接下来的十年中，大型光谱调查将有所增加，尽管计划了许多人，例如Subaru-PFS和NOAO-DESI，但目前正在执行一些高分辨率研究，例如SDSS III-Apogee和ESO-GAIA调查。通过公开发布，这些数据集（以及其他来自Herschel和Alma等其他数据集）可用于解决从银河考古学到碎片磁盘形成的问题。我的研究建议包括几个项目，非常适合对学生和PDF进行HQP培训。