Evolution of Gravitationally Unstable Protostellar DIsks
Evolution of Gravitationally Unstable Protostellar DIsks
复制标题
引力不稳定的原恒星盘的演化
DOI：
10.1086/170740
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
P. Cassen
中科院分区：
文献类型：
--
作者：
T. Steiman;L. Tomley;P. Cassen
从旋转的星际云形成单个恒星，通常需要重新分配星际云的角动量，使得大部分质量（最终存在于星星中）只保留一小部分角动量，大部分角动量沉积在星周盘中。在一个不断增长的圆盘中，引力不稳定性会通过自激密度波的作用促进这种重新分布。我们试图通过在控制能量损失的条件下，对长波长不稳定性的非线性发展进行二维N体模拟来量化这一过程，预测长波长不稳定性发生在盘的形成阶段的早期
The formation of single stars from rotating interstellar clouds generally requires that the angular momentum of the cloud be redistributed in such a way that a major fraction of the mass (eventually residing in the star) retains only a minor fraction of the angular momentum, most of the latter being deposited in a circumstellar disk. Gravitational instabilities in a growing disk would promote such a redistribution by the action of self-excited density waves. We have attempted to quantify this process by conducting two-dimensional, N-body simulations of the nonlinear development of long-wavelength instabilities predicted to occur early in the formation stage of the disk, under conditions of controlled energy loss