Theoretical Astrophysics Research

理论天体物理学研究

• 批准号: 9016810
• 负责人: Moshe Elitzur
• 金额: $ 18万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-04-01 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9016810&HistoricalAwards=false
• 关键词: Theoretical; Astrophysics; Research

This grant supports Dr. Elitzur's research on projects which share the common theme of application of radiative transfer techniques for line analysis in various astronomical environments. The topics include studies of star forming regions; the envelopes of late-type stars; and photoionized regions, such as the accretion disks of cataclysmic variable stars. The structure of and physical conditions in these various astronomical objects will be studieed from their line emission in the ultraviolet, optical, infrared, and radio spectral regions. Dr. Elitzur applies radiative transfer techniques to four specific topics. (1) The polarization of line radiation provides important information on the properties of the source where it was generated. A solid theoretical framework is needed to interpret the observational data. (2) Two of the more prominant properties of star forming regions are strong maser emission from hydroxyl and water vapor and powerful outflows of material. The theoretical implications of both issues are addressed by Dr. Elitzur. (3) In the area of late-type stars a long range goal of Dr. Elitzur's research is the construction of a coherent picture for the outer envelopes, where a multitude of interesting effects are observed. (4) The study of accretion disks has steadily gained importance in the last few years with the mounting evidence that disks are a common occurrence in astronomical systems of all scale sizes.

这项赠款支持Elitzur博士的项目研究， 辐射传递技术应用的共同主题 用于各种天文环境中的线分析。 的主题 包括对星星形成区的研究; 恒星;和光电离区域，如吸积盘， 激变变星 结构和物理 将研究这些不同天体的情况 从它们在紫外线、光学、红外线和 无线电频谱区 Elitzur博士将辐射转移技术应用于四个特定的 话题 (1)线辐射的偏振提供了重要的 关于其产生的源的属性的信息。 需要一个坚实的理论框架来解释 观测数据 (2)两个更明显的性质， 星星形成区域是来自羟基的强脉泽发射， 水蒸气和物质的强烈外流。 理论 Elitzur博士对这两个问题的影响进行了讨论。 (3)在 晚型恒星的区域是埃利祖尔博士的长期目标 研究是为外部世界构建一个连贯的图景， 信封，在那里观察到许多有趣的效果。 (4)对吸积盘的研究在1970年逐渐变得重要起来。 在过去的几年里，越来越多的证据表明，磁盘是一种 在所有尺度的天文系统中都很常见。