US-Sweden Cooperative Research: Observation and Modeling of Stellar Atmospheres

该奖项支持PI和科罗拉多大学博尔德分校的学生与乌普萨拉大学天文学和空间物理系的Kjell Erksson合作。该项目的技术重点是建立进化的冷恒星扩展大气条件的精确模型。美国和瑞典团队的互补专业知识将使模拟进化的巨星和超巨星的不均匀风流出成为可能，模拟矮星和巨星中的碳氧化物线，使用塞曼分裂和最先进的辐射传输代码测量恒星磁场，并建立晚期巨星和超巨星的演化位置和质量。这种合作的更广泛的影响是，它增加了美国研究人员与瑞典研究人员之间的互动，它促进了美国学生的合作机会和职业发展，它通过为未来的国际研究和教育机会奠定基础，加强了研究和教育的基础设施，特别是通过计划中的恒星光谱分析和建模国际暑期学校。

0318835BrownThis award supports the PI and students from the University of Colorado-Boulder in a collaboration with Kjell Erksson of the Department of Astronomy and Space Physics at the University of Uppsala. The technical focus of the project is to develop accurate models of the conditions in the extended atmospheres of evolved cool stars. The complementary expertise of the US and Swedish groups will make it possible to model the inhomogeneous wind outflow from evolved giants and super giants, model the carbon monoxides lines in dwarfs and giants, measure stellar magnetic fields using Zeeman splitting and state-of-the-art radiative transfer codes, and establish evolutionary positions and masses of late-type giants and super giants.The broader impacts of this collaboration are that it increases interactions between US researchers and those in Sweden, it promotes collaborative opportunities and career development for US students, and it enhances the infrastructure for research and education by laying the groundwork for future international research and education opportunities, especially through a planned international summer school on Analysis and Modeling of Stellar Spectra.