Cause and Evolution of the Nova Outburst

现在人们已经很清楚，“新星”的爆发是由双星伴星的富氢物质倾倒到白矮星上，以及白矮星热外壳中的聚变反应使这些物质爆炸造成的。然而，这一过程的细节和导致爆炸的事件尚不清楚。例如，他们依赖于一系列影响近距离双星演化的未知因素，以及从恒星发出的冲击波的流体动力学演化。首席研究员（PI）将对这些过程进行为期三年的研究。拨款期间的重点项目是向磁化白矮星倾倒物质，了解中等质量原子核合成所需的机制，新星爆发停止的原因，以及对新星亚类中复发现象的研究。这项工作有望补充超新星爆炸核合成的工作，因为现在很明显，在我们银河系的早期历史中，重核一定在不同的地方产生。

It is now well understood that the outbursts of "novae" are caused by the dumping of hydrogen-rich material from a binary companion onto a white dwarf and the detonation of this material by fusion reactions in the hot crusts of white dwarfs. However, the details of this process and the events leading up to the explosion are not well understood. For example, they rely on a set of unknowns affecting the evolution of close binary stars and the hydrody- namical evolution of the shock wave as it emanates from the star. The Principal Investigator (PI) will renew his study of these processes for three years. The projects to be focused during the grant period are the dumping of material onto magnetized white dwarfs, an understanding of the mechanisms required for the synthesis of medium-mass nuclei, the cause of the cessation of the nova outburst, and a study of the recurrence phenomenon in one subclass of novae. This work is expected to complement the work on explosive nucleosynthesis in supernovae, as it is now apparent that heavy nuclei must have been produced in a variety of sites in the early history of our Galaxy.