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

本文的目的是研究赫比格Ae/Be系统中吸积盘与中心恒星之间的质量传递机制。赫比格Ae/Be恒星是中等质量的前主序原恒星，它们的流入和流出运动与它们的低质量金牛座T星类似。在金牛座T星的情况下，通常认为从盘到恒星的流入是磁层吸积的结果，而质量是通过磁驱动的流出转移出系统的。这些传质机制需要强大的偶极场，这在金牛座T星中存在，但在赫比格Ae/Be星中通常没有。提出的对年轻赫比格AE/Be恒星的磁驱动流入和流出过程的研究将通过干涉测量和光谱观测以及先进的数值模拟的协调计划来完成。这项研究将提供有关吸积和风产生的质量损失的宝贵见解，因为它们与恒星的形成有关。拟议的项目还将通过一名共同项目负责人的支持，为科学劳动力的发展做出贡献，他目前是密歇根大学的博士后，不久将成为一名研究科学家。该项目包括通过为最近在密歇根州安娜堡重新开放的历史悠久的底特律天文台开发新展品来实现公众宣传目标。这些展品将培养科学素养，重点是天文学研究的基础知识。

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.