Time Dependent Accretion by Magnetic Young Stellar Objects as a Launching Mechanism for Stellar Jets

Winglee，Robert AST 97-29096虽然年轻恒星物体的喷射在恒星形成区域很常见，而且最近的理论和观测工作表明，喷射是低质量恒星早期演化的一个组成部分，也许是必要的，但发射它们的机制还没有完全了解。Winglee博士和Bohm博士研究了一种假设，即这些喷流是磁场和典型年轻恒星周围的吸积盘之间依赖于时间的相互作用的结果。他们的工作建立在早期模拟的基础上，这些模拟证实了喷气式飞机发射机制的基本特征，并产生了与观测一致的喷气式和风的双分量外流。他们的工作将这个模型扩展到一个更完整的参数空间，并根据各种现有的成像和光谱观测来测试该模型。该模式对外流的速度谱、外流观测数据的时间变异性以及这些观测参数与X射线耀斑的相关性以及与吸积流和盘有关的紫外线(UV)和红外(IR)过剩进行了预测，这可以与现有的观测结果进行比较。

Winglee, Robert AST 97-29096 While jets from young stellar objects are common in regions of star formation, and recent theoretical and observational work implies that jets are an integral and perhaps necessary component of the early evolution of low-mass stars, the mechanisms that launch them are not fully understood. Drs. Winglee and Bohm investigate the hypothesis that the jets are the result of a time dependent interaction between the magnetic field and the accretion disk around a typical young star. Their work builds on early simulations that have corroborated the basic features of this launching mechanism for jets, and produced a two-component outflow of jets and winds which is in agreement with observations. Their work extends this model to a more complete parameter space, and tests the model against a variety of existing imaging and spectroscopic observations. The model makes predictions on the velocity spectrum of the outflow, the time variability of the outflow observables, and the correlation of these observed parameters with X-ray flares, as well as ultraviolet (UV) and infrared (IR) excesses associated with accretion streams and disks, which can be tested against existing observations.