Theory of Spectra of Supernovae in the Nebular Phase

95-28256麦克雷 麦克雷博士将继续开发分析超新星光谱的理论工具。 这种分析在星云阶段特别有价值，在最初爆发后的几个月，当超新星碎片已经足够薄，可以观察到爆炸中产生的所有新合成的元素。 使用频谱形成的理论模型对频谱进行解码。 该项目将集中于两个具体项目。 首先是完成综合模型的开发，以描述SN 1987 A光谱的演变，特别是紫外辐射的传输和荧光。 第二是发展Ia型超新星星云光谱的理论模型。 有迹象表明，这可能是一个可靠的方法来校准这些来源的真实光度，从而提供标准烛光，可以确定星系的距离。 ***

95-28256 McCray Dr. McCray will continue to develop theoretical tools for analyzing the spectra of supernovae. This analysis is particularly valuable during the nebular phase, a few months after the initial outburst, when the supernova debris has thinned enough to observe all the newly-synthesized elements created in the explosion. The spectrum is decoded using a theoretical model of spectrum formation. This project will concentrate on two specific projects. The first is to complete the development of comprehensive models to describe the evolution of the spectrum of SN1987A, especially the transfer and fluorescence of the ultraviolet radiation. The second is to develop theoretical models for the nebular spectra of Type Ia supernovae. There are indications that this might be a reliable method for calibrating the true luminosity of such sources, thus providing standard candles with which distances to galaxies can be determined. ***