Multi-dimensional radiative transfer in the expanding atmospheres of massive stars
大质量恒星膨胀大气中的多维辐射传输
基本信息
- 批准号:264145507
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2014
- 资助国家:德国
- 起止时间:2013-12-31 至 2018-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Massive stars are critical agents in galactic evolution, both in the present epoch as well as in the early cosmos, and they are key tools to interpret our Universe. Their high luminosities drive energetic outflows, the stellar winds, that are fundamentally important for the conditions in the neigboring ISM, for triggering star formation, and for massive star evolution. During recent years, the "basic" mass-loss behavior of hot luminous stars became understood, though, e.g., effects from wind-inhomogeneities potentially imply lower mass-loss rates than predicted. However, present limitations in our atmospheric models restrict our diagnostic capabilities to test more advanced predictions. These refer particularly to the effects of fast rotation, magnetic fields, and neighborhood to the Eddington-limit/super-Eddington conditions, requiring a multi-dimensional treatment, not only with respect to hydrodynamics, but also regarding radiative transfer and occupation numbers.Though many groups have invested considerable effort in developing their own multi-D radiative transfer codes designed for specific purposes, none of these codes has been routinely applied to "realistic" wind conditions accounting for non-LTE effects. Here, we suggest a project with the "ultimate" goal (beyond the present proposal) to test recent and upcoming theoretical models predicting the impact of (rapid) rotation, magnetic-fields, and inhomogeneities on the stellar winds and photospheres of massive stars, by coupling 3-D radiative transfer with corresponding NLTE-calculations based on our fast-performing atmosphere code FASTWIND.Our "immediate" objective of this proposal is to develop, in a first step, adequate tools for the solution of 3-D radiative transfer (continuum and line radiation) in asymmetric, rapidly expanding atmospheres with non-monotonic velocity fields. We plan to use a Cartesian grid, and to test the accuracy and performance of two methods, namely a spatially implicit finite volume method as suggested by Adam (1990), and a (more conventional) short characteristics method, both amended by an Accelerated Lambda Iteration. After comparing the two methods, we will decide on our final approach. Since parallelization is of prime importance, we will consider and test suitable strategies for various architectures. As first applications, we will study the formation of UV-resonance lines and Balmer_alpha (the most important mass-loss diagnostics) in models of rapidly rotating and magnetically confined winds, and compare with observations. Already these investigations will allow for preliminary constraints on such models.The techniques developed in this and future projects will enable to investigate many more multi-D problems in massive star atmospheres. To speed up progress, we plan to make the developed tools available to the community.
大质量恒星是银河系演化中的关键因素,无论是在当今时代还是在早期宇宙中,它们都是解释我们宇宙的关键工具。它们的高亮度驱动能量外流,即恒星风,这对邻近的ISM的条件、触发恒星形成和大质量恒星演化都是至关重要的。在最近几年中,人们了解了热发光恒星的“基本”质量损失行为,尽管例如,风的不均匀性的影响可能意味着比预测的更低的质量损失速率。然而,我们大气模型目前的局限性限制了我们测试更高级预测的诊断能力。这些特别涉及快速旋转、磁场和邻近爱丁顿极限/超爱丁顿条件的影响,需要进行多维处理,不仅涉及流体动力学,而且涉及辐射传输和占据数。尽管许多小组投入了大量精力来开发他们自己的针对特定目的的多维辐射传输程序,但这些程序都没有被常规地应用于考虑非LTE影响的“现实”风条件。在这里,我们建议一个具有“最终”目标的项目(在目前的建议之外),通过将三维辐射传输与基于我们快速执行的大气程序FASTWIND的相应NLTE计算相耦合,来测试最近和即将到来的预测(快速)自转、磁场和不均匀对大质量恒星的恒星风和光球层的影响的理论模型。我们这个建议的“直接”目标是,在第一步,开发足够的工具来解决具有非单调速度场的非对称、快速膨胀的大气中的三维辐射传输(连续和线辐射)。我们计划使用笛卡尔网格,并测试两种方法的精度和性能,即Adam(1990)建议的空间隐式有限体积方法和(更传统的)短特征法,这两种方法都经过了加速的Lambda迭代。在比较了这两种方法之后,我们将决定我们的最终方法。由于并行化是最重要的,我们将考虑并测试适用于各种架构的策略。作为第一个应用,我们将研究快速旋转和磁约束风模型中UV共振线和Balmerα(最重要的质量损失诊断)的形成,并与观测结果进行比较。这些研究已经允许对这些模型进行初步限制。在这个项目和未来的项目中开发的技术将使我们能够在大质量恒星大气中研究更多的多维问题。为了加快进度,我们计划将开发的工具提供给社区使用。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
3D radiative transfer: Continuum and line scattering in non-spherical winds from OB stars
3D 辐射传输:OB 星非球形风中的连续散射和线散射
- DOI:10.1051/0004-6361/201731858
- 发表时间:2018
- 期刊:
- 影响因子:6.5
- 作者:Hennicker L;Puls J;Kee N. D;Sundqvist J. O.
- 通讯作者:Sundqvist J. O.
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Privatdozent Dr. Joachim Puls其他文献
Privatdozent Dr. Joachim Puls的其他文献
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{{ truncateString('Privatdozent Dr. Joachim Puls', 18)}}的其他基金
Small-scale inhomogeneities and their impact on observed mass-loss rates of radiation-driven winds
小尺度不均匀性及其对观测到的辐射驱动风质量损失率的影响
- 批准号:
179960930 - 财政年份:2011
- 资助金额:
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