Blue Supergiants as Probes of Stellar and Galactic Evolution in the Local Group

蓝超巨星作为本星系群恒星和星系演化的探针

• 批准号: 36534647
• 负责人: Professor Dr. Norbert Przybilla
• 金额: --
• 依托单位: Dr. Remeis-Sternwarte Bamberg - Astronomisches Institut -
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/36534647?language=en
• 关键词: Blue; Supergiants; Probes; Stellar; Galactic

Blue Supergiants are the visually brightest normal stars in star-forming galaxies. The present generation of large telescopes facilitates high-resolution spectroscopy of such objects within the Local Group of galaxies. Analyses of a statistically significant sample of objects in the two metal-rich giant spiral galaxies of the Local Group, the Milky Way and M 31, and in two metal-poor dwarf irregular galaxies, the Small Magellanic Cloud and NGC6822, will be performed. Recent developments in plasmaphysical stellar atmosphere modelling allow us to use blue supergiants as versatile tools for quantitative studies of stellar and galactochemical evolution. Precise stellar parameters and abundance determinations of the light elements will put tight observational constraints on evolution models for massive stars over a wide range of chemical composition. Galactic abundance patterns and gradients for numerous heavier elements will be probed to a far greater extent than possible by classical analyses of H II regions. These will provide a sound observational basis for the study of the cosmic cycle of matter and the chemical evolution of the four galaxies under study. The project will also allow to calibrate and establish blue supergiants as spectroscopic distance indicators on the first step of the cosmic distance ladder.

蓝超巨星是恒星形成星系中视觉上最明亮的正常恒星。目前这一代的大型望远镜有助于对本星系群内的这类天体进行高分辨率光谱分析。将对本星系群中两个富含金属的巨型螺旋星系银河系和M 31以及两个贫金属的矮不规则星系小麦哲伦星云和NGC6822中具有统计意义的天体样本进行分析。等离子体恒星大气模型的最新发展使我们能够使用蓝超巨星作为定量研究恒星和银河化学演化的通用工具。精确的恒星参数和轻元素丰度的测定将在大质量恒星的演化模型上施加严格的观测约束。银河系的丰度模式和许多较重的元素的梯度将探测到更大的程度比可能的经典分析的H II区。这将为研究宇宙物质循环和所研究的四个星系的化学演化提供良好的观测基础。该项目还将允许校准和建立蓝超巨星作为宇宙距离阶梯第一步的光谱距离指标。

项目成果

Quantitative spectroscopy of Galactic BA-type supergiants I. Atmospheric parameters ,

银河BA型超巨星的定量光谱I 大气参数，

• DOI: 10.1051/0004-6361/201219034
• 发表时间: 2012
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: Firnstein;Przybilla
• 通讯作者: Przybilla