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

AST-0507514 Edward Sion Villanova University白矮星在激变变数中：演化和增长的探测器物理学摘要将对白矮星的表面温度、自转速度和化学丰度进行调查，这些系统包括磁性和非磁性的。将采用的主要工具是宽波长范围(X射线、紫外线、可见光)的多组分合成光谱拟合和具有时变吸积的演化模型模拟。白矮星和非磁性盘吸积系统中的白矮星和边界层结构在矮新星和类新星的低光亮态期间暴露时的性质，以及磁变星(极和中间极)处于低亮态时的性质，将特别受到关注。总体目标是更好地了解这些白矮星和激变变星系统的年龄、进化史、质量、扩散速率、角膜层转移机制、核合成史和许多其他方面，这反过来将产生对新星、超新星类型和银河化学演化的洞察。几名本科生将参与这些研究的方方面面，从获取、还原到分析，到在期刊上发表结果和在国家会议上发表演讲。

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.