U.S.-U.K. Cooperative Research: Stellar Opacities and Atomic Data

该奖项将支持博士之间的合作研究。俄亥俄州立大学的A.K. Pradhan和D. Mihalas，以及在贝尔法斯特皇后大学的P.G. Burke博士和伦敦大学学院的M. Seaton博士的指导下的两组英国天文学家。提出的研究目标是对原子数据和恒星不透明度进行精确的大规模计算。在过去的七年里，一个大型国际项目一直在进行大规模的原子计算，其最终目标是以前所未有的精度计算恒星的不透明度。恒星物质的不透明性在恒星的结构和演化中起着至关重要的作用，因为它控制着几乎所有恒星某些区域放射性能量的传输。恒星的不透明性也与引起恒星脉动的不稳定性有关，这在当前天文研究的许多方面都很重要。拟议的研究项目是由英国、美国、德意志联邦共和国、法国和委内瑞拉的原子物理学家和天文学家联合合作进行的，其目的是采用最先进的原子物理学方法，能够得出基本的原子参数。如振子强度和光电离截面，精度在5-10%的范围内。这个项目是由dr。西顿和柏克。该奖项将允许美国队成员参加。此次合作将受益于米哈拉斯博士在恒星大气理论方面的广泛专业知识和普拉丹博士在原子物理学方面的广泛专业知识。

This award will support collaborative research between Drs. A.K. Pradhan and D. Mihalas, Ohio State University, and two groups of British astronomers under the direction of Dr. P.G. Burke, Queens University, Belfast and Dr. M. Seaton, University College, London. The objective of the proposed research is to carry out accurate large scale calculations of atomic data and stellar opacities. For the last seven years a major international project has been underway to carry out large scale atomic calculations with the final aim of calculating stellar opacities of unprecedented precision. The opacity of stellar material plays a fundamental role in the structure and evolution of stars, as it controls the transport of radioactive energy in some regions of virtually all stars. The stellar opacity is also intrinsically involved in the instabilities that give rise to stellar pulsation, which are important in a number of respects in current astronomical research. The aim of the proposed research project, which is a joint collaboration between atomic physicists and astronomers in the United- Kingdom, the U.S., the Federal Republic of Germany, France and Venezuela, is to employ state-of-the-art atomic physics methods that are capable of yielding the basic atomic parameters, such as oscillator strengths and photoionization cross sections, to a high degree of accuracy in the range of 5-10%. The project is being led by Drs. M. Seaton and P.G. Burke. This award will permit the participation of members of the U.S. team. The collaboration will benefit from the extensive expertise of Dr. Mihalas in stellar atmosphere theory and Dr. Pradhan in atomic physics.