Magnetic braking during star formation I
Magnetic braking during star formation I
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恒星形成过程中的磁制动 I
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
R. Paris
中科院分区：
文献类型：
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作者：
J. Gillis;L. Mestel;R. Paris
我们研究了阿尔文波从一个冷的大质量气体云的角动量传输，阿尔文波沿着扭曲的磁场将云与热的银河系背景联系起来。制动的效率从来没有大到使云甚至与背景大致共转。数学近似法不够精确，无法对这个问题给出明确的答案：制动是否如此有效，以至于离心力保持在远低于重力的水平，从而使云团以（磁稀释的）自由落体速率收缩？还是云保持着近似的离心平衡，收缩率由角动量的损失决定？
We study the transport of angular momentum from a cool massive gas cloud by Alfvén waves travelling along the distorted magnetic field linking the cloud with the hot galactic background. The efficiency of braking is never so great as to keep the cloud even roughly corotating with the back-ground. The mathematical approximations are not quite sharp enough to give a definitive answer to the question: is the braking ever so efficient that the centrifugal forces are kept well below gravity, so that the cloud contracts at the (magnetically-diluted) free-fall rate?; or is the cloud maintained in approximate centrifugal balance, with the rate of contractiondetermined by the loss of angular momentum?