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, Kim
• 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: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=515018
• 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.

我的研究主要是针对星系形成场景的观测测试。通过确定各种恒星群的化学特征，从晕场恒星到球状星团，再到各种矮星系中的恒星，我们可以重建每个系统的化学演化，并将其与半解析模型和n体模拟对本星系群合并历史的预测进行比较。在NSERC的更新中，我概述了两个新的硕士项目，两个新的博士项目，以及一个需要PDF专业知识的项目，这些都在我的研究目标和合作范围内。PDF项目包括对船底座矮星系的化学演化进行建模，根据我目前从其RGB恒星的高分辨率光谱中计算的详细化学丰度比率；该职位将为维多利亚大学带来新的专业知识，同时补充现有资源。博士项目包括：(1)分析孤立矮不规则星系中各种恒星群的金属丰度、运动学和年龄，特别是对老恒星群进行分析，以与原星系碎片模型进行比较；(2)对外晕球状星团中的恒星进行详细分析，以确定外晕的均匀性和起源。后一个项目将作为硕士项目开始。另一个MSc项目包括对新的超微弱矮星系中恒星的详细化学分析，这些星系可能包含本星系群中最缺乏金属的恒星。这里概述了另一个关于尘埃对缺乏金属的恒星的化学影响的项目。这些项目是维多利亚大学恒星化学新项目的一部分，它补充了现有的恒星演化和星系形成的强大项目，以及一个新开发的恒星核合成项目。