The Tempurature and Ionization Structure of Non-Spherical Circumstellar Envelopes

非球形星周包层的温度和电离结构

• 批准号: 9819928
• 负责人: Jon Bjorkman
• 金额: $ 27.59万
• 依托单位: University of Toledo
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2004-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819928&HistoricalAwards=false
• 关键词: Tempurature; Ionization; Structure; Non; Spherical

ABSTRACTBjorkman, JonAST-9819928This project focuses on the development of modeling techniques for the determination of radiation fields, temperatures and ionization properties for non-spherical stellar atmospheres and circumstellar envelopes. Such models are critically needed to interpret a wide variety of new high spatial and spectral resolution observations that are now available for such objects as Wolf-Rayet stars, Herbig-Haro Ae/Be stars, O- and B-type stars, and evolving asymptotic giant branch stars. In addition, the product of this research is likely to be useful in interpreting the observational properties of objects that have experienced explosive eruptions, like supernovae. The initial effort will employ a Monte Carlo (statistical) approach to approximating the radiative transfer calculations of non-equilibrium axisymmetric and 'clumpy' atmospheres. The new work builds upon a previously developed two-dimensional axisymmetric model of winds from rapidly rotating hot stars, the so-called "wind-compressed disk model."

Bjorkman，JonAST-9819928本项目的重点是发展用于确定非球形恒星大气和拱星包层的辐射场、温度和电离特性的建模技术。 这种模型是迫切需要解释各种各样的新的高空间和光谱分辨率的观测，现在可用于这样的对象，如沃尔夫-拉叶星，赫比格-哈罗Ae/Be星，O-和B-型星，和演变的渐近巨星分支星。 此外，这项研究的成果可能有助于解释经历过爆炸性爆发的物体的观测特性，如超新星。 最初的努力将采用蒙特卡罗（统计）方法来近似计算非平衡轴对称和“cloudless”大气的辐射传输。 这项新工作建立在先前开发的快速旋转热恒星风的二维轴对称模型，即所谓的“风压缩盘模型”的基础上。"