Runaway stars in our Galaxy

逃逸恒星是在远离银盘的地方发现的炙热的年轻恒星。它们像所有年轻的恒星一样在盘中形成，然后通过与其他恒星的近距离接触或在一个巨大的伴星爆炸成为超新星后被抛出。逃逸恒星是研究银河系结构的绝佳工具。知道了它们的速度和固有运动，就可以追溯到它们在银河系盘中的起源点。与以前的调查相比，盖亚的数据可以大大提高准确性。盖亚视差也使得首次对这些天体进行系统搜索成为可能。以前的逃逸恒星只是其他调查的副产品。由于大多数逃离者都是在银河系的高纬度地区发现的，他们没有经历过严重的变红，这使得对星系盘的螺旋结构的研究变得非常困难。因此，它们可以用来追踪通常由于变红和混乱而隐藏的螺旋臂。

Runaway stars are hot, young stars found faraway from the Galactic disc. They are formed in the disk as all young stars and then ejected by close encounters with other stars or after a massive companion exploded as supernova. Runaway stars are excellent tools to study the structure of our Galaxy. Knowing their velocity and proper motions they can be traced back to their point of origin in the Galactic disc. Gaia data allows an enormous improvement of accuracy compared to previous investigations. Gaia parallaxes also make it possible to carry out a systematic search for these objects for the first time. Previously runaway stars were only found as by-product of other surveys. Since most runaways are found at high galactic latitude they do not experience the heavy reddening, which makes studies, e.g., of the spiral structure of the galactic disc so difficult. Thus they can be used to trace spiral arms usually hidden due to reddening and confusion.