Accretion and outflows in the limit of weak stellar magnetic fields: does the magnetospheric accretion paradigm apply to Herbig AeBe stars?

该方案的目的是研究HerBig Ae/Be系统中吸积盘与中心星之间的质量传递机制。赫比格Ae/Be恒星是中等质量的、主序列前的原恒星，显示出类似于低质量T金牛座恒星的流入和流出运动的证据。就T-Tauri恒星而言，从盘状物质流入恒星通常被认为是磁层吸积的结果，而质量是通过磁驱动的流出系统转移出去的。这些质量传输机制需要强大的偶极场，这种场存在于T-Tauri恒星中，但通常在HerBig Ae/Be恒星中找不到。拟议中的对年轻HerBig AE/Be恒星中磁驱动的流入和流出过程的研究将通过干涉和光谱观测的协调计划以及先进的数值模拟来完成。这项研究将提供关于吸积和风生质量损失的有价值的见解，因为它们与恒星的形成有关。拟议的项目还将通过一名目前是博士后、即将成为大学研究科学家的合作者的支持，促进科学队伍的发展。来自密歇根州。该项目包括将通过为最近在密歇根州安娜堡重新开放的历史底特律天文台开发新展品来实现的公共推广目标。这些展品将培养科学素养，重点放在天文研究的基础上。

The goal of this proposal is to investigate the mass transfer mechanism between the accretion disk and the central star in Herbig Ae/Be systems. Herbig Ae/Be stars are intermediate-mass, pre-main-sequence protostars that show evidence of inflow and outflow motions similar to their lower-mass T Tauri star counterparts. In the case of T Tauri stars, the inflow from the disk to the star is generally thought to be the result of magnetospheric accretion, while mass is transferred out of the system via magnetically driven outflows. These mass transfer mechanisms require strong dipolar fields, which are present in T Tauri stars but are generally not found in Herbig Ae/Be stars. The proposed investigation of magnetically driven inflow and outflow processes in young Herbig AE/Be stars will be accomplished through a coordinated program of interferometric and spectroscopic observations along with advanced numerical modeling. This research will provide valuable insight regarding accretion and wind-generated mass loss as they relate to the formation of stars. The proposed project will also contribute to scientific workforce development through the support of a co-PI who is currently a postdoc soon to become a research scientist at the Univ. of Michigan. The project includes public outreach goals that will be accomplished through the development of new exhibits for the historical Detroit Observatory recently re-opened in Ann Arbor, MI. These exhibits will foster scientific literacy with an emphasis on the fundamentals of astronomical research.