吸积盘与恒星在星云盘中形成时的角动量损失

Accretion Disk and Angular Momentum Loss During Formation of a Star in the Nebular Disk

本文根据吸积盘理论与天文观测结果,给出一个恒星在星云盘中形成的模型,通过计算角动量方程,获得了质量定常分布ρ(r)～r^(-β)(β=0,1,2)时的一般性解对1M恒星的数值解表明:恒星在转动磁化的星云盘中形成时,角动量确实发生了巨大转移;并且,β=2的解能较满意地解释太阳系的角动量奇异性.

We propose a model for the formation of a star in a nebular disk on the basis of the accretion disk theory and the phenomena observed in recent years. By calculating the angu-lar momentum equation, we have obtained the general solutions under the condition of the constant mass distribution, i.e.p(r)~r^(-β) (β = 0,1,2)N urn erical solution for a I M star shows that the angular momentum of the disk is indeed being transferred from the disk during the star formation in a rotating and magnetized nebular disk, and that the solution of β = 2 gives comparatively satisfactory explanations for the singularity of the angular momentum in the solar system.