Cause and Evolution of the Nova Outburst

现在人们已经很好地理解，新星的爆发是由于从双星伙伴向白矮星倾倒富氢物质，并通过白矮星热壳中的聚变反应引爆这种物质造成的。然而，这一过程的细节以及导致爆炸的事件还没有被很好地理解。例如，它们依赖于一组未知数，这些未知数影响着近距离双星的演化，以及从恒星发出的冲击波的流体动力学演化。首席调查员(PI)将重新研究这些过程，为期三年。赠款期间的重点项目是将物质倾倒到磁化的白矮星上，了解合成中等质量核所需的机制，停止新星爆发的原因，以及研究新星的一个亚类中的重现现象。这项工作预计将补充关于超新星爆炸性核合成的工作，因为现在很明显，在我们银河系的早期历史上，重核一定是在不同的地点产生的。

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.