Spectral Analyses of Old Stellar Populations (Stars and Stellar Evolution): VPW

这个建议是计算和应用理论恒星 在本星系群球状星团中的恒星光谱， 为了量化金属丰度校准， 调查相对于 轻元素丰度和平均恒星年龄。 的 工作将基于模型和光谱产生的 新扩展的库鲁茨线列表，其中复制了两个 太阳的通量分布和个别谱线强度， 太阳系附近的巨大大角星 第一 拟议工作的阶段将是计算模型， 银河系球状星团中单个冷巨星的光谱 星团M4、M71和Tuccino 47;疏散星团M67; 银河系膨胀。 目标是确定总体 金属丰度和轻元素丰度比 氧、镁、硅、钙、钠和铝， 为了展示爆炸性的程度 核合成控制了各种元素的生产 环境和时代。 在此之后，理论光谱 对于不同金属丰度的较热恒星， 接近太阳，无论有没有光元素 增强. 这些光谱的组合适合于 然后将不同年龄的人群与 观测到的球状星团的积分光谱， 仙女座菌株同时估计铁和轻元素 丰度和平均恒星年龄。 拟议的研究代表了“最先进”的工作， 恒星大气和元素丰度， 我们对组成的理解有了实质性的进展 和银河系的演化，即恒星的结构， 元素演化的历史。 该项目进一步 VPW方案的目标是为妇女提供机会， 通过以下方式推进他们在科学或工程领域的职业生涯： 研究，并鼓励其他妇女追求事业， 这些领域通过调查人员的提高能见度， 学校里的榜样 在这方面，建议 有助于实现第二个目标的活动包括： 做关于恒星真实分析的客座讲座 恒星大气研究生课程中的丰度， 在一次关于望远镜应用应如何 写着

This proposal is to calculate and apply theoretical stellar spectra to stars in globular clusters in the Local Group, in order to quantify the metallicity calibration and to investigate the occurrence of variations in the relative abundances of light elements and in the mean stellar age. The work will be based on models and spectra generated from the newly expanded line list of Kurucz, which have reproduced both flux distributions and individual line strengths of the Sun and the cool giant Arcturus in the solar neighborhood. The first stage of the proposed work will be to calculate models and spectra for individual cool giants in the Galactic globular clusters M4, M71, and 47 Tucanae; the open cluster M67; and the Galactic bulge. The goal is to determine the overall metallicity and the abundance ratio of the light elements oxygen, magnesium, silicon, calcium, sodium, and aluminum with respect to iron, to show to what extent explosive nucleosynthesis dominated the element production in various environments and epochs. Following this, theoretical spectra will be completed for hotter stars of various metallicities near that of the Sun, both with and without light element enhancements. Combinations of these spectra appropriate to clusters of different ages will then be compared to the observed integrated-light spectra of globular clusters in Andromeda to simultaneously estimate the iron and light-element abundances and the mean stellar age. The proposed research represents "state of the art" work in stellar atmospheres and elemental abundances, which could make substantial advances in our understanding of the composition and evolution of the Galaxy, namely structure of stars and history of the evolution of the elements. The project furthers VPW program objectives to provide opportunities for women to advance their careers in science or engineering through research, and to encourage other women to pursue careers in these areas through the investigators' enhanced visibility as role models on the host campuses. In this effort, the proposed activities which contribute to the second objective include: giving guest lectures on the real-life analyses of stellar abundances in a graduate course on stellar atmospheres and presenting a seminar on how telescope applications should be written.