过渡期原恒星中的风驱动吸积
Wind-driven Accretion in Transitional Protostellar Disks
摘要：
过渡性原恒星盘的内腔中的尘埃和气体严重耗尽，但大多数都显示出正在进行的吸积迹象，其速度通常与完整的盘相当。我们表明，最近的限制气体表面密度在几个研究良好的磁盘腔意味着吸积速度至少是跨音速。我们认为这是由磁化风驱动的吸积的自然结果。典型的物理条件的气体内的空腔估计合理的X射线和FUV辐射场。气体是分子的，主要是中性的，具有无量纲双极参数，在柯尼希、沃德尔和其他人开发的风解类型的正确一般范围内。也就是说，离子和电子的密度足以与磁场进行适度良好的耦合，但不会好到磁通量需要被吸积的中性粒子向内拖曳。
英文摘要：
Transitional protostellar disks have inner cavities heavily depleted in dust and gas, yet most show signs of ongoing accretion, often at rates comparable to full disks. We show that recent constraints on the gas surface density in a few well-studied disk cavities imply that the accretion speed is at least transsonic. We propose that this is the natural result of accretion driven by magnetized winds. Typical physical conditions of the gas inside such cavities are estimated for plausible X-ray and FUV radiation fields. The gas is molecular and predominantly neutral, with a dimensionless ambipolar parameter in the right general range for wind solutions of the type developed by Königl, Wardle, and others. That is to say, the density of ions and electrons is sufficient for moderately good coupling to the magnetic field, but not so good that the magnetic flux need be dragged inward by the accreting neutrals.
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