Fundamental Astrophysics from Precision Asteroseismology

该奖项是根据2009年《美国复苏和再投资法案》(公法111-5)资助的。德克萨斯大学的迈克尔·蒙哥马利将领导一个观测和理论相结合的项目，研究脉动的白矮星。他们将在麦克唐纳天文台的2.1米望远镜上使用Argos时间序列光度计，并在智利使用4.1米的SOAR望远镜，在麦克唐纳天文台使用1.2米望远镜，在得克萨斯州中部使用CTAS 0.6米望远镜。将分析新的数据，以解决三个广泛领域的基本天体物理问题。首先，他们将对单个光曲线的详细形状进行建模，以约束湍流热传输(对流)的物理学。该项目的这一部分将使用超级计算机对流的流体动力学模拟。其次，他们将测量由于冷却而导致的脉动周期的变化，这将限制恒星的轴子发射。轴子是暗物质粒子的候选者，因此这项技术的发展和应用可能会为轴子的宇宙学意义提供新的测试。第三，他们将继续对最近发现的一类新的变星--热DQV碳大气层白矮星--进行观测和分析。目前，这一类有三个已知成员。其中两颗恒星包含很强的磁场，使它们成为研究脉动、对流和磁场相互作用的理想目标。该小组将继续为德克萨斯大学奥斯汀分校的新生研究计划制定内容，该计划将涉及尖端科学专业的一年级和二年级学生。和近年来一样，高中生都会参与观察跑步，有三名高中老师加入了这个小组，帮助观察和第一手学习科学方法。该团队正在通过一个项目扩大这种参与，在这个项目中，一小群高中生整晚都被锁在他们的高中；他们通过Argos在线网站与麦克唐纳天文台的观测进行电子链接，并可以与圆顶上的天文学家举行电话会议。此外，他们还与德克萨斯州中部天文学会积极合作。作为该项目的一部分，他们将开发一个可通过网络界面访问的观测数据库。这份档案将允许快速搜索观测结果，并将免费提供给社区。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Dr. Michael Montgomery of the University of Texas will lead a combined observational and theoretical project to study pulsating white dwarf stars. They will use the Argos time-series photometer on the 2.1m at McDonald Observatory, supplemented by the 4.1m SOAR telescope in Chile, the 1.2m telescope at McDonald Observatory, and the CTAS 0.6m telescope in central Texas. New data will be analyzed to address fundamental astrophysical problems in three broad areas. First, they will model the detailed shapes of individual light curves to constrain the physics of turbulent heat transport (convection). This part of the project will employ supercomputer hydrodynamical simulations of convection. Second, they will measure the change in pulsation period due to cooling, which will place constraints on the stars' axion emission. Axions are candidates for dark matter particles, so the development and application of this technique might provide new tests of the cosmological significance of axions. Third, they will continue their observations and analysis of the recently-discovered new class of variable star, the hot DQV carbon-atmosphere white dwarfs. Currently, there are three known members of this class. Two of these stars contain a strong magnetic field, making them ideal targets for studying the interplay of pulsation, convection, and magnetic fields.This group will continue to develop content for the Freshman Research Initiative program at UT-Austin, which will involve freshmen and sophomore science majors in cutting-edge science. As in recent years, high school students will participate in observing runs, and three high school teachers have joined this group to assist in observing and learn the scientific method first hand. The team is broadening this participation through a program whereby small groups of high school students spend entire nights at lock-ins at their high school; they are electronically linked to the observations being taken at McDonald Observatory through the Argos Online website and can teleconference with the astronomers in the dome. In addition, they have an active collaboration with the Central Texas Astronomical Society. As part of this project, they will develop a database of observations accessible via a web interface. This archive will allow rapid searching of the observations, and will be made freely available to the community.