Late Stages of Stellar Evolution

希普曼将继续他关于白矮星大气化学成分的理论研究。重点将是利用适当的白矮星大气模型，通过演化和吸积过程将观测到的丰度模式相互联系起来。这项研究涉及许多合作者。当像太阳这样的恒星耗尽它们的核能资源时，它们会缩小到地球的大小。对这种被称为白矮星的恒星的新观测表明，它们外层的化学丰度比预期的要变化得多。对这些观测结果的一个很好的解释有望大大提高对类太阳恒星如何变成白矮星的理解。希普曼将利用恒星模型、它们的大气模型以及可能从伴星吸积的气体模型来解释这些观测结果。

Shipman shall continue his theoretical research on the chemical compositions of white-dwarf atmospheres. The emphasis will be on interrelating the observed abundance patterns via evolution and accretion processes, using appropriate models of the white-dwarf atmospheres. The research involves numerous collaborators. When stars like the Sun exhaust their nuclear energy sources, they shrink to about the size of the Earth. New observations of such stars, called white dwarfs, show that the chemical abundances in their outer layers are much more varied than expected. A good interpretation of these observations promises a much improved understanding of just how solar-like stars become white dwarfs. Shipman will interpret the observations using models of the stars, of their atmospheres, and of gases that may accrete from companion stars.