沃尔夫-拉叶双星及其星风碰撞活动 postprint

Abstract: As high-mass stars in the end stage of evolution, Wolf-Rayet stars evolve with a significant mass loss due to strong stellar wind. For a binary system formed by a Wolf-Rayet star and a high-mass companion, stellar wind-colliding could result in a colliding-wind binary (CWB) system. And the radiation in wind-colliding region (WCR) is mainly dominated by nonthermal radio radiation. On the one hand, there are several radio sources identified as Wolf-Rayet binaries, such as WR140, WR146 as well as WR147, have been studied widely by radio interferometry technique, finding the stellar wind interactions among these systems. On the other hand, Wolf-Rayet stars such as WR105 may be a candidate of CWB system. Compared with general interstellar medium environment, the density of matter, flux density and magnetic field in WCR are much higher, as a result, particles in this region could obtain much more energy and produce nonthermal radiation, which provide us an extraordinary chance to study how the particles get accelerated and radiated. Moreover, there is a close connection between the activities of WCR and evolutions of binary systems, we can also investigate the final evolution of massive stars by studying the WCR. However, only a handful of results associated with CWB systems are published, and a special attention is given to WR140 predominantly due to a complete physical model has been established on it. In this context, we briefly introduce the research background of WR binary systems and their stellar wind collision activities, especially the contributions of radio interferometer observations on CWBs in recent years.