论文标题
探索情节WCD系统WR140中的灰尘生长
Exploring dust growth in the episodic WCd system WR140
论文作者
论文摘要
碰撞的风二进制（CWB）中的风碰撞区（WCR）是一个特别暴力的地方，因此，令人惊讶的是，它也是大量大量星际灰尘可以形成的区域。在极端情况下，系统总质量损失率的大约30％可以转换为灰尘。这些区域对这些系统的观察和模拟很困难，因此对这些区域的理解很少。在我们以前的论文中，我们使用Adved标量模型模拟了CWB系统中的尘埃生长，并发现我们的模型适合定性研究。在本文中，我们使用我们的粉尘模型模拟了周期性的灰尘形成CWB（WCD）系统WR140，以确定尘埃生长如何在系统periastron通道中变化。我们发现，在Periastron通道时，灰尘产生显着增加，这与周围尘土飞扬的壳的发射一致。我们还发现，随着恒星彼此退缩，系统的尘埃生产速率迅速降低，尽管降低速度显着低于Periastron通过期间的增加速率。发现这是由于冷却及其相关的热不稳定性引起的，导致在灰尘形成的WCR中产生冷藏，高密度的气体。 WCR还显示出一定程度的磁滞，即使恒星分离足以使该区域的绝热表现，也会导致辐射震后流动。
The wind collision region (WCR) in a colliding wind binary (CWB) is a particularly violent place, as such, it is surprising that it is also a region where significant quantities of interstellar dust can form. In extreme cases, approximately 30% of the total mass loss rate of a system can be converted into dust. These regions are poorly understood, as observation and simulation of these systems are difficult. In our previous paper we simulated dust growth in CWB systems using an advected scalar model and found our model to be suitable for qualitative study. For this paper we simulated the periodic dust forming CWB (WCd) system WR140 with our dust model, to determine how dust growth changes over the systems periastron passage. We found that dust production increases significantly at periastron passage, which is consistent with IR emission of the surrounding dusty shell. We also find that the dust production rate of the system decreases rapidly as the stars recede from each other, though the rate of decrease is significantly lower than the rate of increase during periastron passage. This was found to be due to strong cooling and its associated thermal instabilities, resulting in cool, high-density pockets of gas in the WCR where dust forms. The WCR also shows a degree of hysteresis, resulting in a radiative post-shock flow even when the stars are separated enough for the region to behave adiabatically.
