Theoretical and Observational Studies of the Contributions of Novae to Galactic Chemical Evolution

新星对银河化学演化贡献的理论和观测研究

• 批准号: 9819795
• 负责人: Sumner Starrfield
• 金额: $ 11.5万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819795&HistoricalAwards=false
• 关键词: Theoretical; Observational; Studies; Contributions; Novae

ABSTRACTAST-9819795Starrfield, SumnerThis research seeks to improve the agreement between the observational properties and theoretical understanding of novae, recurrent novae and some types of symbiotic binary stars. Efforts to improve the computed models will focus on incorporating a proper treatment of the nuclear physics (i.e. b-limited CNO cycle reactions), convective motions at the peak of the explosion, and spatial distribution of the ejecta. The objective is to achieve a better agreement with the observed light and radial velocity curves of three specific novae for which extensive observations are available. A detailed understanding of these types of luminous stellar outbursts impacts areas outside the immediate field. Such events contribute to the enrichment of the interstellar medium by heavy elements. Their peak luminosities provide ways of calibrating the distances to structures within our Galaxy, and also to the extragalactic distance scale.

本研究旨在改善新星、循环新星和某些类型的共生双星的观测性质与理论理解之间的一致性。改进计算模型的努力将侧重于纳入对核物理(即b-受限CNO循环反应)、爆炸峰值对流运动和抛射物的空间分布的适当处理。这样做的目的是为了更好地与观测到的三个特定新星的光速和径向速度曲线保持一致，这些新星可以进行广泛的观测。详细了解这些类型的发光恒星爆发对近场以外区域的影响。这些事件有助于重元素对星际介质的富集化。它们的峰值亮度提供了校准到银河系内部结构和银河系外距离尺度的距离的方法。