标题： S-PLUS内部第四数据释放中高速恒星的表征 显示英文标题

标题： Characterisation of high velocity stars in the S-PLUS internal fourth data release

摘要： 一般来说，银河系中一些恒星的异常高速度只能通过引入与银河系中极端天体物理事件相关的加速机制来解释。 利用盖亚（Gaia）的天体测量数据和S-PLUS在12个滤光片中的光度信息，我们对64颗具有超过400 $\mathrm{km\,s}^{-1}$的银河中心速度的恒星进行了运动学、动力学和化学分析。 所有恒星都受银河系引力束缚，并表现出晕族运动学特征。 其中一些恒星可能是类似Sequoia和Gaia-Sausage/Enceladus等结构的残余。 通过轨道和化学分析的支持，我们将Gaia DR3 5401875170994688896识别为很可能起源于银河系中心的恒星。 将机器学习技术应用于S-PLUS的光度数据，使我们能够对该高速恒星样本的镁丰度获得非常精确的估计。 显示英文摘要

摘要： In general, the atypical high velocity of some stars in the Galaxy can only be explained by invoking acceleration mechanisms related to extreme astrophysical events in the Milky Way. Using astrometric data from Gaia and the photometric information in 12 filters of the S-PLUS, we performed a kinematic, dynamical, and chemical analysis of 64 stars with galactocentric velocities higher than 400 $\mathrm{km\,s}^{-1}$. All the stars are gravitationally bound to the Galaxy and exhibit halo kinematics. Some of the stars could be remnants of structures such as the Sequoia and the Gaia-Sausage/Enceladus. Supported by orbital and chemical analysis, we identified Gaia DR3 5401875170994688896 as a star likely to be originated at the centre of the Galaxy. Application of a machine learning technique to the S-PLUS photometric data allows us to obtain very good estimates of magnesium abundances for this sample of high velocity stars.