Collaborative Research: Herbig-Haro Flows as Probes of Early Stellar Evolution

合作研究：赫比格-哈罗流作为早期恒星演化的探针

• 批准号: 0407005
• 负责人: Bo Reipurth
• 金额: --
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-06-01 至 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0407005&HistoricalAwards=false
• 关键词: Collaborative; Research; Herbig; Haro; Flows

Star formation is the only remaining major phase of stellar evolution that is still poorly understood, especially the very earliest evolutionary stages when the nascent stars are still deeply embedded in the regions of their formation. Analysis of material flows from the very young Herbig-Haro stars, and in particular of the subset of highly collimated Herbig-Haro jets, provide indirect but important insights into the nature of the accretion and mass loss processes which govern the formation of stars. The recent studies open the possibility to partially reconstruct the mass ejection history of the newly born driving sources and therefore their mass accretion history. This project is completing a major interference filter imaging survey of all nearby star forming regions in order to identify Herbig-Haro flows, analyzing the properties of the more than 700 Herbig-Haro flows known so far to derive their statistical properties, repeating their northern survey to obtain proper motions and energetics of the outflows, studying the launch and collimation regions of jets and their visible sources by high resolution optical and infrared spectroscopy, obtaining adaptive optics assisted near-infrared images and centimeter radio continuum maps of the sources of material flows in order to study their multiplicity and to test jet formation scenarios, and finally, an advanced magnetohydrodynamical code simulates the cooling regions of the shocks for a better understanding of the complex shapes and motions uncovered by the observational efforts.Broader impact:. The study of Herbig-Haro flows is providing a framework within which other classes of astrophysical jets may be interpreted. This research continues to involve both graduate and undergraduate students. Through the 2 meter Faulkes telescope at Haleakala (the world's largest telescope exclusively dedicated to teaching high school students), the investigators also offer small research programs related to these material flows and their energy sources. Long term efforts to disseminate these results to the public continue through talks, astronomy shows, and presentations at schools.

星星的形成是恒星演化中唯一一个仍然知之甚少的主要阶段，特别是在最早的演化阶段，新生恒星仍然深深地嵌入它们形成的区域。对非常年轻的赫比格-哈罗恒星的物质流，特别是高度准直的赫比格-哈罗喷流的分析，为恒星形成的吸积和质量损失过程的性质提供了间接但重要的见解。最近的研究开启了部分重建新生驱动源的质量喷射历史以及它们的质量吸积历史的可能性。 该项目正在完成对附近所有星星形成区域的主要干涉滤光成像调查，以确定赫比格-哈罗流，分析迄今已知的700多个赫比格-哈罗流的特性，以得出其统计特性，重复其北方调查，以获得流出物的自行和能量，利用高分辨率光学和红外光谱学研究喷流及其可见光源的发射和准直区域，获得自适应光学辅助近，物质流源的红外图像和厘米无线电连续谱图，以便研究其多样性和测试喷流形成的情景，最后，一个先进的磁流体动力学代码模拟冷却区的冲击，更好地了解复杂的形状和运动所揭示的观测工作。对赫比格-哈罗流的研究提供了一个框架，在这个框架内可以解释其他类别的天体物理喷流。这项研究继续涉及研究生和本科生。通过哈雷阿卡拉的2米Faulkes望远镜（世界上最大的望远镜，专门用于教授高中生），研究人员还提供了与这些物质流及其能源有关的小型研究计划。 通过讲座、天文表演和在学校的演讲，向公众传播这些成果的长期努力仍在继续。