Galaxy formation and the chemistry of stars

星系的形成和恒星的化学

• 批准号: 327292-2009
• 负责人: Venn, Kimberley
• 金额: $ 3.86万
• 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: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=481670
• 关键词: Galaxy; formation; chemistry; stars

My research is primarily directed at observational tests of galaxy formation scenarios. By determining the chemical signatures for various stellar populations from halo field stars, to globular clusters, to stars in a variety of dwarf galaxies, then we can reconstruct the chemical evolution of each system and compare that with predictions for the merger history of the Local Group from semi-analytic models and N-body simulations. In this NSERC renewal, I outline two new MSc projects, two new PhD projects, and a project that requires PDF expertise, all within my research goals and collaborations. The PDF project involves modeling of the chemical evolution of the Carina dwarf galaxy from the detailed chemical abundance ratios that I am currently calculating from high resolution spectra of its RGB stars; this position will bring new expertise to UVic while also complementing the existing resources. The PhD projects include (1) the analysis of the metallicity, kinematics, and ages of the various stellar populations in the isolated dwarf irregular galaxies, particularly of the old stellar populations to compare with models of protogalactic fragments, and (2) the detailed analysis of stars in outer halo globular clusters to determine the homogeneity and origins of the outer Galactic halo. This latter project would begin as an MSc project. The other MSc project includes the detailed chemical analysis of stars in the new ultra faint dwarf galaxies which may harbour the most metal-poor stars in the Local Group. An additional project on the effects of dust on the chemistry of metal-poor stars is outlined herein. These projects are part of the new program in stellar chemistry at UVic, which compliments the existing strong programs in stellar evolution and galaxy formation, as well as a newly developing program in stellar nucleosynthesis.

我的研究主要针对星系形成方案的观察测试。 通过确定从光环田间恒星到球形簇，到各种矮星系中的恒星的各种恒星种群的化学特征，然后我们可以重建每个系统的化学演化，并将其与当地组的合并历史进行比较来自半分析模型和N体模拟。 在此NSERC续订中，我概述了两个新的MSC项目，两个新的博士学位项目，以及一个需要PDF专业知识的项目，全部在我的研究目标和协作中。 PDF项目涉及对Carina Dwarf Galaxy的化学演化进行建模，我目前正在从其RGB恒星的高分辨率光谱中计算出的详细的化学丰度比；该职位将为UVIC带来新的专业知识，同时还可以补充现有资源。 博士学位项目包括（1）在孤立的矮人不规则的星系中的各种恒星种群的金属性，运动学和年龄的分析，尤其是旧的恒星种群，以比较与杂质性的碎片模型，以及（2）详细分析的分析外晕球状簇中的恒星，以确定外银光环的同质性和起源。 后一个项目将从MSC项目开始。 另一个MSC项目包括对新的超矮矮星系中恒星的详细化学分析，这些星系可能具有本地组中最贫穷的恒星。 本文概述了关于灰尘对金属贫困恒星化学恒星化学影响的另一个项目。 这些项目是UVIC恒星化学计划的一部分，该计划补充了恒星进化和星系形成中现有的强大计划，以及恒星核合成中新开发的程序。