Nonlinear Stellar Pulsations

buchler， J. robert本研究旨在提高对周期变星和非周期变星观测特征的理论认识，这些变星的能量输出在天到周的时间尺度上发生变化。了解这些类型的发光变星的物理影响超出了恒星研究领域。由于它们的亮度与它们表现出的变异性类型有关，这项工作直接有助于校准我们银河系内结构的距离，也有助于校准河外距离尺度。一套详细的对流流体动力学模型，辅以半解析计算，将建立经典变量，如造父变星和天琴座RR星。此外，这个代码将被应用于更奇特的非周期变量，如弗吉尼亚星和金牛座RV星，它们经常在银河系的老年人口中发现。该项目由美国国家科学基金会恒星天文学和天体物理学计划（SAA）和国际计划，中欧和东欧（INT）提供资金。

ABSTRACT AST-9819608Buchler, J. RobertThis research seeks to improve the theoretical understanding of the observed characteristics of periodic and nonperiodic variable stars, whose energy output changes on timescales of days to weeks. Understanding the physics of these types of luminous variable stars impacts areas beyond the field of stellar research. Since their luminosities are related to the type of variability they exhibit, this work contributes directly to calibrating the distances to structures within our Galaxy, and also to the extragalactic distance scale. A detailed set of convective hydrodynamic models, supplemented by semi-analytical computations, will be constructed for classical variables such as Cepheids and RR Lyrae stars. In addition, this code will be applied to more exotic nonperiodic variables such as W Virginis and RV Tauri stars that are often found in the older populations of the Galaxy.Funding for this project was provided by the NSF programs for Stellar Astronomy & Astrophysics (SAA) and the International Programs, Central and Eastern Europe (INT).