RUI: White Dwarfs in Cataclysmic Variables: Probes of Evolution and Accretion Physics

RUI：灾难变星中的白矮星：演化和吸积物理学的探索

• 批准号: 0507514
• 负责人: Edward Sion
• 金额: --
• 依托单位: Villanova University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507514&HistoricalAwards=false
• 关键词: RUI; White; Dwarfs; Cataclysmic; Variables

AST-0507514Edward SionVillanova UniversityWhite Dwarfs in Cataclysmic Variables: Probes of Evolution and AccretionPhysicsAbstractA survey of surface temperatures, rotation rates, and chemical abundances of white dwarfs incataclysmic variable systems (both magnetic and non-magnetic) will be performed. The principletools to be employed are multi-component synthetic spectral fitting over a wide wavelength range(X-ray, uv, visible) and evolutionary model simulations with time varying accretion. Particularattention will be paid to the properties of the white dwarfs and boundary layer structure in nonmagnetic,disk-accreting systems when they are exposed during the quiescences of dwarf novae andthe low optical brightness states of nova-like variables, as well as the properties of the white dwarfsin magnetic CVs (polars and intermediate polars) when they are in low brightness states. Theoverall goal is to better understand the ages, evolutionary histories, masses, diffusion rates, angularmomentum transfer mechanisms, nucleosynthesis histories, and many other aspects of these whitedwarfs and cataclysmic variable systems, which in turn will yield insight into novae, Type Iasupernovae, and Galactic chemical evolution.Several undergraduate students will be involved in all aspects of these studies, from acquisition, toreduction, to analysis, to publication of results in journals and presentations at national meetings.

AST-0507514爱德华·西昂维拉诺瓦大学激变变星中的白色矮星：进化和吸积物理学的探测摘要将对激变变星系统（磁性和非磁性）中的白色矮星的表面温度、旋转速率和化学丰度进行调查。将采用的principletools是多组分合成光谱拟合在很宽的波长范围内（X射线，紫外线，可见光）和进化模型模拟随时间变化的吸积。特别注意的是白色矮星的性质和边界层结构，当它们暴露在矮新星和类新星变星的低光学亮度状态的宁静期间，以及白色矮星的性质，在磁CV（极和中间极）时，它们在低亮度状态。总的目标是更好地了解这些白矮星和激变变星系统的年龄、演化历史、质量、扩散速率、角动量转移机制、核合成历史以及许多其他方面，从而深入了解新星、Iaserovae型新星和银河系化学演化。几名本科生将参与这些研究的各个方面，从获取、还原到分析，在期刊上发表成果并在国家会议上发言。