Distances and line-of-sight velocities of 964 Gaia Data Release 2 (DR2) OB stars of Xu et al. within 3 kpc from the Sun and 500 pc from the Galactic mid-plane with accuracies of <50 per cent are selected. The data are used to find small systematic departures of velocities from the mean circular motion for the stars in the solar neighborhood due to the spiral compression-type (Lin–Shu-type) waves, or spiral density waves, e.g. those produced by real instabilities of spontaneous gravity disturbances, a central bar or a companion system. A key point of the study is that our results are consistent with the ones extracted from the asymptotic density-wave theory. Revised parameters of density waves in the solar vicinity of the Galaxy are also provided.

中文翻译：

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银河系附近的螺旋密度波结构：盖亚 DR2 OB 恒星的视线速度

Xu 等人的 964 Gaia Data Release 2 (DR2) OB 星的距离和视距速度。选择距离太阳 3 kpc 以内和距离银河中平面 500 pc 以内，精度小于 50%。这些数据用于发现由于螺旋压缩型（Lin-Shu-type）波或螺旋密度波，例如由真实不稳定性产生的那些，太阳附近恒星的速度与平均圆周运动的小系统偏差自发的重力扰动、中央棒或伴生系统。该研究的一个关键点是我们的结果与从渐近密度波理论中提取的结果一致。还提供了银河系太阳附近密度波的修正参数。