Variability of Accreting Magnetized Stars

【摘要】新发展的数值方法将应用于盘与磁化恒星相互作用的问题。具体来说，磁盘-磁层相互作用的三维模型将使用基于膨胀立方体网格的数字代码生成。模拟将用于帮助将观测数据与基础物理联系起来。目的是帮助理解不同类型磁化恒星（经典金牛座T星、突变变星和吸积中子星）的变异性本质。考虑到这一点，将进行四种不同的活动：(1)模拟将以尽可能接近观测约束的参数运行；(2)研究了二维和三维数值模拟的不同变率和准变率机制；(3)计算和分析模型磁化恒星的光曲线，确定功率谱中不同峰的来源；(4)将开发一个程序，寻找观测到的和模拟的光曲线之间的最佳匹配。包括对研究生和本科生的复杂磁流体动力学物理以及高级编程和建模技术的培训。研究结果将通过在当地科学博物馆开展的教育/公众外展计划，以及通过向学童和教育工作者开展的虚拟现实外展计划向公众传播。

AST 0507760Marina RomanovaCornell UniversityVariability of Accreting Magnetized StarsABSTRACTNewly developed numerical methods will be applied to problems of disk interactions withmagnetized stars. Specifically, 3-dimensional models of disk-magnetosphere interactions will begenerated using numerical codes based on an inflated cube grid. The simulations will be used tohelp link observational data with underlying physics. The goal is to help understand the nature ofthe variability of different types of magnetized stars (Classical T Tauri stars, cataclysmic variables,and accreting neutron stars). With this in mind, four different activities will be undertaken: (1)simulations will be run with parameters as close to observational constraints as possible; (2)different mechanisms of variability and quasi-variability which follow from 2-dimensional and 3-dimensional numerical modeling will be investigated; (3) the light-curves from the modeledmagnetized stars will be calculated and analyzed to determine the origin of different peaks in thepower spectra; and (4) a program will be developed which will search for the best match betweenobserved and modeled light curves.Included is the training of graduate and undergraduate students in complex magnetohydrodynamicphysics as well as advanced programming and modeling techniques. The results obtained here willbe disseminated to the public through an education/public outreach program at the local ScienceMuseum and through a Virtual Reality outreach program to school children and educators.