Theoretical Astrophysics Research

这笔赠款支持Elitzur博士的项目研究，这些项目共享在各种天文环境中应用辐射传输技术进行线分析的共同主题。这些主题包括恒星形成区域的研究；晚类型恒星的包层；以及光电离区域，如激变变星的吸积盘。这些天体的结构和物理条件将通过它们在紫外线、光学、红外和射电光谱区域的线发射来研究。埃利祖尔博士将辐射传输技术应用于四个特定的主题。(1)线辐射的偏振提供了有关产生它的源的性质的重要信息。需要一个坚实的理论框架来解释观测数据。(2)恒星形成区的两个更显著的特征是来自羟基和水蒸气的强烈脉泽发射和强烈的物质外流。埃利祖尔博士阐述了这两个问题的理论含义。(3)在晚型恒星区域，埃利祖尔博士研究的一个长期目标是为外包层构建一张连贯的图像，在那里可以观察到许多有趣的效应。(4)近几年来，随着越来越多的证据表明吸积盘在各种尺度的天文系统中普遍存在，吸积盘的研究逐渐变得重要起来。

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.