Nonlinear Stellar Pulsations

非线性恒星脉动

• 批准号: 8914425
• 负责人: J. Robert Buchler
• 金额: --
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-01 至 1993-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8914425&HistoricalAwards=false
• 关键词: Nonlinear; Stellar; Pulsations

Quite possibly all stars pulsate, though in most stars the pulsations are so small and the stars are so distant that the pulsations are very difficult to detect. For example, in the case of the sun, pulsations have been detected only recently with newly developed instrumentation, giving rise to the science of "helioseismology." Ther are, however, stars that pulsate rather strongly. These stars grow visibly brighter and dimmer, and they expand and contract. Some do so with rather regular periods, as for example the Cepeheid and RR Lyra stars; others are quite erratic in their pulsations, such as the RV Tauri stars. The Principal Investigator (PI) proposes to continue with his current NSF funded theoretical and numerical study of pulsating stars of all types, from Cepeheids and RR Lyra stars to Semi- Regulars and the RV Tauri stars. The computing method will consist of a "judicious mixture of semi-analytical amplitude equation formalism and of numerical hydrodynamics." The goal will be to develop one-parameter families of pulsating star models, rather than to study specific observed stars. In support of this study, the PI proposes to expand his current computer codes to make them more realistic and to interpret stellar pulsation in terms of chaos theory.

很可能所有的恒星都有脉动，尽管在大多数恒星中， 脉动是如此之小，恒星是如此之远， 脉动是很难检测到的。 为例 太阳的脉动最近才被发现， 发展了仪器，从而产生了 “日震学。“然而，有些恒星的脉动 强烈地。 这些恒星明显地变得越来越亮，越来越暗， 膨胀和收缩。 有些人这样做是有规律的，如 例如造父变星和天琴座RR型星;其他的则相当 脉动不稳定，比如金牛座RV星 主要研究者（PI）建议继续其 目前NSF资助的脉动的理论和数值研究 所有类型的恒星，从造父变星和天琴座RR型恒星到半- 常客和金牛座房车明星。 计算方法将 由“半解析振幅 方程形式主义和数值流体力学。“目标将 发展单参数脉动星星模型族， 而不是研究特定的观测恒星。 为了支持这项研究，PI建议扩大他目前的 计算机代码使它们更真实， 恒星脉动的混沌理论。