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: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=588779
• 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.

我的研究主要是通过光谱丰度分析来研究恒星系统的化学演化，其主要目的是了解星系从最早时代的演化和富集，以及提高我们对元素起源的理解。描述了此类工作的几个相关途径，在我们自己的矮星系和附近的矮星系中对特定目标（贫金属恒星、化学奇特恒星、超出潮汐半径的恒星）进行了详细的光谱分析。矮星系）可以解决元素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。在过去的十年中产生了重大影响，但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。中心是另一个有趣的区域，那里尚未发现大量贫金属恒星，但数值模拟表明，第一颗恒星在大质量晕的引力中心附近点燃，形成无金属的大质量恒星。使用光度测量和光谱技术对银河系核球中的贫金属恒星进行观测——其中之一将包括首次使用 Subaru-RAVEN 多目标自适应光学原型，未来十年将会看到大型恒星的增加。光谱调查，虽然许多正在计划中，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（以及我的研究提案包括几个非常适合学生 HQP 培训和 PDF 的项目。