论文标题
SDSS/Apogee DR17中的高速恒星
High Velocity Stars in SDSS/APOGEE DR17
论文作者
论文摘要
我们报告了23个星星在Apogee调查的最终数据发布中，大于$ 450〜 \ mathrm {km \，s}^{ - 1} $的星形中心速度。该样品是使用Sloan Digital Sky Survey的数据版本17（DR17）中的高质量径向速度得出的空间速度生成的，该速度具有距离和盖亚早期数据版本3（EDR3）的距离和适当的运动。我们考虑了星系的不同潜在模型，分析了观察到的这些恒星的运动学和衍生动力学。我们发现，根据采用的潜力，三颗星可能是未结合的，但总的来说，所有恒星都显示出光环恒星的典型运动学。 Apogee DR17光谱结果和GAIA EDR3光度法用于评估恒星的恒星参数和化学特性。所有的恒星都属于红色巨型分支，通常，它们遵循典型的光环恒星的丰富模式。有一些例外值得通过高分辨率光谱进行进一步的分析。特别是，我们确定了高速碳增强金属贫困（CEMP）星，其半乳化速度为482 km \，s $^{ - 1} $。我们没有在样品中确认任何高速恒星，但是该结果对所采用的距离非常敏感，并且对银河电位敏感。
We report 23 stars having Galactocentric velocities larger than $450~\mathrm{km\,s}^{-1}$ in the final data release of the APOGEE survey. This sample was generated using space velocities derived by complementing the high quality radial velocities from the APOGEE project in Sloan Digital Sky Survey's Data Release 17 (DR17) with distances and proper motions from Gaia early Data Release 3 (eDR3). We analyze the observed kinematics and derived dynamics of these stars, considering different potential models for the Galaxy. We find that three stars could be unbound depending on the adopted potential, but in general all of the stars show typical kinematics of halo stars. The APOGEE DR17 spectroscopic results and Gaia eDR3 photometry are used to assess the stellar parameters and chemical properties of the stars. All of the stars belong to the red giant branch, and, in general, they follow the abundance pattern of typical halo stars. There are a few exceptions that would deserve further analysis through high-resolution spectroscopy. In particular, we identify a high velocity Carbon-Enhanced Metal-Poor (CEMP) star, with Galactocentric velocity of 482 km\,s$^{-1}$. We do not confirm any hypervelocity star in the sample, but this result is very sensitive to the adopted distances, and less sensitive to the Galactic potential.
