Theoretical Astrophysics Research

这项资助支持Elitzur博士的研究项目，这些项目分享了在各种天文环境中应用辐射传输技术进行线谱分析的共同主题。主题包括恒星形成区域的研究；晚期恒星的外壳；还有光电离区域，比如变星的吸积盘。这些不同天体的结构和物理条件将从它们在紫外、光学、红外和无线电光谱区域的线发射中进行研究。Elitzur博士将辐射转移技术应用于四个特定的主题。(1)线辐射的极化提供了有关其产生源性质的重要信息。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突出的特性是羟基和水蒸气的强微波发射和物质的强大流出。这两个问题的理论含义都是由Elitzur博士解决的。(3)在晚型恒星领域，埃利泽尔博士研究的一个长期目标是为外层结构构建一幅连贯的图像，在外层结构中可以观察到许多有趣的效应。近年来，随着越来越多的证据表明，吸积盘在各种规模的天文系统中都是常见的现象，对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.