High-velocity Stars in SDSS/APOGEE DR17
High-velocity Stars in SDSS/APOGEE DR17
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DOI：
10.3847/1538-3881/ac90bc
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发表时间：
2022-09
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通讯作者：
F. Quispe-Huaynasi;F. Roig;Devin McDonald;V. Loaiza-Tacuri;S. Majewski;Fábio Wanderley;K. Cunha;C. Pereira;S. Hasselquist;S. Daflon
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作者：
F. Quispe-Huaynasi;F. Roig;Devin McDonald;V. Loaiza-Tacuri;S. Majewski;Fábio Wanderley;K. Cunha;C. Pereira;S. Hasselquist;S. Daflon
在APOGEE巡天的最终数据发布中，我们报告了23颗银心速度大于450 km s-1的恒星。这个样本是使用空间速度生成的，空间速度是通过补充斯隆数字巡天数据发布17（DR 17）中的APOGEE项目的高质量径向速度与盖亚早期数据发布3（eDR 3）的距离和自行来获得的。我们分析观察到的运动学和派生动力学的这些恒星，考虑不同的潜在模型的银河系。我们发现，三颗恒星可以是未绑定的依赖于所采用的潜力，但在一般情况下，所有的恒星表现出典型的晕星的运动学。APOGEE DR 17光谱和Gaia eDR 3光度测量结果被用来评估恒星的恒星参数和化学性质。所有的恒星都属于红巨星分支，并且，一般来说，它们遵循典型晕星的丰度模式。有一些例外值得通过高分辨率光谱学进行进一步分析。特别是，我们发现了一颗高速的碳增强贫金属星星，其银河系中心速度为482 km s−1。我们没有确认样本中有任何超高速星星，但这个结果对所采用的距离非常敏感，对银河系势不太敏感。
We report 23 stars having Galactocentric velocities larger than 450 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 star, with a 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.