U.S.-Korea Cooperative Research on Contact and Semidetached Close Binary Systems of Case B Mass Exchange

本提案请求资助内布拉斯加州大学林肯分校物理与天文学教授梁金清博士与韩国延世大学Nha Il-Seong博士进行为期24个月的双星系统中B类质量交换的接触和半分离系统的合作研究项目。这些科学家将对许多这样的系统进行光电观测研究，周期从长到很长（11天到96天）不等。该研究结果可用于验证或比较理论模型的预测，并用于构建未来的双星系统理论模型。这个项目涉及对一种相对未被观测到的双星的亮度规律变化的观测和分析，这些双星彼此距离足够近，从而改变彼此的演化，但距离足够远，公转周期是许多天。对这些双星的研究对于理解恒星的演化和理解更复杂的、经常是爆炸性的双星是很重要的。该项目与美韩合作科学项目的目标相关，该项目旨在通过科学信息、思想、技能和技术的交流以及在互利问题上的合作，提高美韩科学家和工程师之间的合作水平。美国和韩国的合作者是在提案领域拥有丰富的研究经验和成果发表记录的备受尊敬的科学家。

This proposal requests funds to permit Dr. Kam-Ching Leung, Professor of Physics and Astronomy, University of Nebraska-Lincoln, to pursue with Dr. Il-Seong Nha, Yonsei University, Korea, for a period of 24 months, a program of cooperative research on contact and semidetached systems of case B mass exchange in binary star systems. These scientists will make a photoelectric observational study of a number of such systems with periods ranging from long to very long (11 days to 96 days). The results of this research could be used for checking or comparing the predictions of theoretical models and for construction of future theoretical models of binary star systems. This project deals with observations and analysis of the regular changes in brightness of a relatively unobserved category of binary stars which are close enough to each other so as to alter each other's evolution but far enough apart that the period of revolution is many days. The investigation of these binary stars is important for understanding the evolution of stars and for understanding the more complicated, often explosive, binary stars. This project is relevant to the objectives of the U.S.-Korea Cooperative Science Program which seeks to increase the level of cooperation between U.S. and Korean scientists and engineers through the exchange of scientific information, ideas, skills, and techniques and through collaboration on problems of mutual benefit. The U.S. and Korean collaborators are highly respected scientists who have extensive research experience and productive publication records in the field of the proposal.