大质量恒星形成的记录：用SiO脉泽探测猎户座源I在10-100 AU尺度上的动力学演化
A Documentary of High-Mass Star Formation: Probing the Dynamical Evolution of Orion Source I on 10-100 AU Scales using SiO Masers
摘要：
高质量恒星形成的全面图景仍然难以捉摸，部分原因是高质量YSO的例子往往相对遥远，深深嵌入，并与其他发射源混淆。这些因素阻碍了在几十个天文单位的大质量YSO内进行动力学研究-这些尺度对于探测从吸积盘流出的物质被发射和准直的界面至关重要。利用VLA和VLBA获得的SiO脉泽的观测结果，KaLYPSO项目正在克服这些限制，通过映射距离最近的高质量YSO：猎户座BN/KL区域的射电源I的材料10-1000 AU的结构和动力学/时间演化。我们的数据包括~40个时期的VLBA观测在几年的时间内，使我们能够跟踪个别SiO脉泽斑点的自行和监测发射材料的物理条件随时间的变化。最终，这些数据将提供约30%流出道穿越时间内流出道结构的3-D图。在这里，我们总结了最近的结果从KaLYPSO项目，包括证据表明，高质量的恒星形成是通过磁盘介导的吸积。
英文摘要：
A comprehensive picture of high-mass star formation has remained elusive, in part because examples of high-mass YSOs tend to be relatively distant, deeply embedded, and confused with other emission sources. These factors have impeded dynamical investigations within tens of AU of high-mass YSOs--scales that are critical for probing the interfaces where outflows from accretion disks are launched and collimated. Using observations of SiO masers obtained with the VLA and the VLBA, the KaLYPSO project is overcoming these limitations by mapping the structure and dynamical/temporal evolution of the material 10-1000 AU from the nearest high-mass YSO: Radio Source I in the Orion BN/KL region. Our data include ~40 epochs of VLBA observations over a several-year period, allowing us to track the proper motions of individual SiO maser spots and to monitor changes in the physical conditions of the emitting material with time. Ultimately these data will provide 3-D maps of the outflow structure over approximately 30% of the outflow crossing time. Here we summarize recent results from the KaLYPSO project, including evidence that high-mass star formation is occurring via disk-mediated accretion.
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