论文标题
关于快速二进制传质 - I.物理模型
On rapid binary mass transfer -- I. Physical model
论文作者
论文摘要
在某些半独立的二元系统中，供体恒星可以以很高的速度将质量转移到同伴。我们建议，以足够高的质量转移速率，使同伴周围的积聚磁盘在磁盘外半径附近变得几何厚（或以趋势为主导），由于粘液热的产生的过多的能量会导致不可能受益于受益的散热，因此将通过外部拉格朗日（L2）点丢失了很大一部分的转移质量。在磁盘中的剩余材料具有等于L2势能的要求，构建了一个物理模型，其中L2质量损失分数是通过要求的。我们的模型预测，质量转移率的明显L2质量损失超过几次10^{-4} msun/yr。在这些系统中形成了赤道外循环流出（CBO）。讨论了对轨道进化和观察性外观的影响。特别是（1）系统的快速角动量损失倾向于收缩轨道，因此可能会增加合并和重力波源的形成速率； （2）来自热盘风的光子被CBO重新加工到红外带中的更长的波长发射，这与Spitzer观察到一些超光X射线源的观察结果一致。
In some semi-detached binary systems, the donor star may transfer mass to the companion at a very high rate. We propose that, at sufficiently high mass-transfer rates such that the accretion disk around the companion becomes geometrically thick (or advection-dominated) near the disk outer radius, a large fraction of the transferred mass will be lost through the outer Lagrangian (L2) point, as a result of the excessive energy generated by viscous heating that cannot be efficiently radiated away. A physical model is constructed where the L2 mass loss fraction is given by the requirement that the remaining material in the disk has Bernoulli number equal to the L2 potential energy. Our model predicts significant L2 mass loss at mass-transfer rates exceeding a few times 10^{-4} Msun/yr. An equatorial circum-binary outflow (CBO) is formed in these systems. Implications for the orbital evolution and the observational appearance are discussed. In particular, (1) rapid angular momentum loss from the system tends to shrink the orbit and hence may increase the formation rate of mergers and gravitational-wave sources; (2) photons from the hot disk wind are reprocessed by the CBO into longer wavelength emission in the infrared bands, consistent with Spitzer observations of some ultra-luminous X-ray sources.
