磁场在前主序星中的作用
The role of magnetic fields in pre-main sequence stars
摘要：
强，千高斯，磁场需要解释一系列的观测性质，在年轻的，吸积前主序星（PMS）系统。我们回顾了用于检测PMS星磁场的技术。从一个长期运行的运动，旨在描述吸积金牛座T星的大尺度磁场的关键结果。这些系统中的表面磁通量地图可以用来建立三维模型，探索磁场的作用以及磁场将吸积从星周盘引导到年轻恒星的效率。金牛座T星磁场的长期变化强烈地指向磁场的发电机起源。研究正在进行中，以量化磁场的变化如何影响它们的吸积特性。我们还提出了第一个结果，从一个新的方案，调查磁场的演变在中间质量（1.5-3 Msun）前主序星，因为它们从对流金牛座T星充分辐射Herbig AeBe星的演变。
英文摘要：
Strong, kilo-Gauss, magnetic fields are required to explain a range of observational properties in young, accreting pre-main sequence (PMS) systems. We review the techniques used to detect magnetic fields in PMS stars. Key results from a long running campaign aimed at characterising the large scale magnetic fields in accreting T Tauri stars are presented. Maps of surface magnetic flux in these systems can be used to build 3-D models exploring the role of magnetic fields and the efficiency with which magnetic fields can channel accretion from circumstellar disks on to young stars. Long-term variability in T Tauri star magnetic fields strongly point to a dynamo origin of the magnetic fields. Studies are underway to quantify how changes in magnetic fields affect their accretion properties. We also present the first results from a new programme that investigates the evolution of magnetic fields in intermediate mass (1.5-3 Msun) pre-main sequence stars as they evolve from being convective T Tauri stars to fully radiative Herbig AeBe stars.
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