Collaborative Research: Chemical Evolution Beyond the Milky Way

提案编号：在这个与德克萨斯大学埃尔帕索分校的Verne Smith（AST-0307534）的合作项目中， Shetrone博士将通过确定一些邻近星系中恒星的化学成分来研究不同星系环境中的化学演化。 PI将获得高分辨率，高信噪比光谱的演化恒星在一个样本的星系，其中包括矮椭球体，不规则和螺旋。 利用最新的大气模型、最新的原子和分子数据以及光谱分析代码，对它们进行详细的丰度分析，将得出多达25种元素的丰度。 由于这些元素是在不同类型和寿命的恒星中产生的，相对丰度的趋势提供了对星星形成细节和各种银河系环境中化学演化时间尺度的深入了解。 这项工作将对理解宇宙的化学演化产生重大影响。 本科生和研究生都将参与这项研究。 ***

PROPOSAL NO: AST 0306884PI: Matthew ShetroneINSTITUTION: University of Texas, Austin In this collaborative project with Verne Smith of the University of Texas, El Paso (AST-0307534), Dr. Shetrone will study the chemical evolution in different galactic environments by determining the chemical composition of stars in a number of nearby galaxies. The PIs will obtain high-resolution, high signal-to-noise spectra of evolved stars in a sample of galaxies that includes dwarf spheroidals, irregulars, and spirals. Their detailed abundance analysis, using the latest model atmospheres and up-to-date atomic and molecular data and spectral analysis codes, will yield abundances of up to 25 elements. Because these elements are generated in stars of different types and lifetimes, the trends in relative abundances provide insight into the details of star formation and the timescales of chemical evolution in a variety of galactic environments. The work will have significant impact on the understanding of the chemical evolution of the universe. Both undergraduate and graduate students will be involved in the research. ***