Radiation Hydrodynamics of Porosity-Mediated Mass Loss from Super-Eddington Stars

超级爱丁顿星孔隙介导的质量损失的辐射流体动力学

• 批准号: 0507581
• 负责人: Stanley Owocki
• 金额: $ 44.94万
• 依托单位: University of Delaware
• 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=0507581&HistoricalAwards=false
• 关键词: Radiation; Hydrodynamics; Porosity; Mediated; Mass

AST-0507581Stanley OwockiUniversity of DelawareRadiation Hydrodynamics of Porosity-Mediated Mass Loss from Super-Eddington StarsABSTRACTThe nature of mass loss/wind generation from massive stars with luminosities near the Eddington limit will be investigated. The motivation lies in the need to understand the origin and consequences of extreme stellar winds and associated mass loss from Luminous Blue Variable stars such as Eta Carinae. Of special importance here is the potential role of continuum-driven mass loss which may play an important role in determining the fate of massive stars with low abundances of heavy elements, including the super-massive pure hydrogen/helium stars which may be responsible for the re-ionization of the early universe. Two key aspects will be explored in four complementary subprojects: the role of small scale density variations in reducing the coupling between radiation and matter; and the role of rapid rotation and accompanying equatorial gravity darkening which could lead to bipolar mass loss (as seen in Eta Carinae). Such mass loss may also lead to the rapid core rotation associated with the hypernova model of gamma ray bursts. The overall goal is the development of a self-consistent radiation hydrodynamic model of the spatial structure that can moderate radiative driving of extensive mass loss in very luminous stars.Both a graduate student and a postdoctoral fellow will be trained in developing, testing, and interpreting the hydrodynamic models used in this project. The work performed by the graduate student will form the basis of their Ph.D. thesis. Results will be disseminated through articles in popular journals and public talks at all levels (as well as professional journals in astronomy).

AST-0507581 Stanley Owocki特拉华大学超艾丁顿星孔隙介导的质量损失的辐射流体力学摘要将研究光度接近艾丁顿极限的大质量恒星的质量损失/风产生的性质。其动机在于需要了解极端恒星风的起源和后果，以及来自亮蓝变星（如Eta Carinae）的相关质量损失。这里特别重要的是连续性驱动的质量损失的潜在作用，它可能在决定重元素丰度低的大质量恒星的命运方面发挥重要作用，包括可能导致早期宇宙再电离的超大质量纯氢/氦星。将在四个相辅相成的分项目中探讨两个关键方面：小尺度密度变化在减少辐射和物质之间的耦合方面的作用;以及快速旋转和伴随的赤道重力暗化的作用，这可能导致两极质量损失（如Eta Carinae所见）。这种质量损失也可能导致与伽马射线爆发的超新星模型相关的快速核心旋转。总的目标是发展一个自洽的辐射流体动力学模型的空间结构，可以缓和辐射驱动的广泛的质量损失非常明亮的恒星。研究生和博士后研究员都将在开发，测试和解释在这个项目中使用的流体动力学模型的培训。研究生完成的工作将构成他们博士学位的基础。论文研究结果将通过在大众期刊上发表文章和在各级（以及天文学专业期刊）举行公开讲座的方式传播。