To improve the census of the Upper Sco association (~11 Myr, ~145 pc), we have identified candidate members using parallaxes, proper motions, and color-magnitude diagrams from several wide-field imaging surveys and have obtained optical and infrared spectra of several hundred candidates to measure their spectral types and assess their membership. We also have performed spectroscopy on a smaller sample of previously known or suspected members to refine their spectral types and evidence of membership. We have classified 530 targets as members of Upper Sco, 377 of which lack previous spectroscopy. Our new compilation of all known members of the association contains 1631 objects. Although the census of Upper Sco has expanded significantly over the last decade, there remain hundreds of candidates that lack spectroscopy. The precise parallaxes and proper motions from the second data release of Gaia should extend down to substellar masses in Upper Sco, which will greatly facilitate the identification of the undiscovered members.

中文翻译：

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上天蝎座协会中的新年轻恒星和褐矮星

为了改进上斯科协会（~11 Myr，~145 pc）的普查，我们使用视差、自行和来自几次广域成像调查的颜色幅度图来识别候选成员，并获得了光学和红外光谱数百名候选人来测量他们的光谱类型并评估他们的成员资格。我们还对先前已知或可疑成员的较小样本进行了光谱分析，以完善其光谱类型和成员资格证据。我们已将 530 个目标分类为 Upper Sco 成员，其中 377 个缺乏先前的光谱。我们对协会所有已知成员的新汇编包含 1631 个对象。尽管上斯科省的人口普查在过去十年中显着扩大，但仍有数百名候选人缺乏光谱学。盖亚第二次数据发布的精确视差和自行应该延伸到上斯科的次恒星质量，这将极大地促进未被发现的成员的识别。