We present the results of a radial velocity survey of a sample of Hyades stars and discuss the effects of stellar activity on radial velocity measurements. The level of radial velocity scatter due to rotational modulation of stellar surface features for the Hyades is in agreement with the 1997 predictions of Saar & Donahue—the maximum radial velocity rms of up to ~50 m s-1, with an average rms of ~16 m s-1. In this sample of 94 stars we find one new binary, two stars with linear trends indicative of binary companions, and no close-in giant planets. We discuss the limits on extrasolar planet detection in the Hyades and the constraints imposed on radial velocity surveys of young stars.
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机译：我们介绍了Hyades恒星样本的径向速度调查的结果，并讨论了恒星活动对径向速度测量的影响。 Hyades恒星表面特征的旋转调制引起的径向速度散射水平与Saar＆Donahue在1997年的预测一致-最大径向速度rms高达〜50 m s-1，平均rms为〜 16 m s-1。在这个94颗恒星的样本中，我们发现了一颗新的双星，两颗具有线性趋势的双星，这些恒星表示双星伴星，并且没有近距离的巨型行星。我们讨论了海德斯太阳系外行星探测的极限以及对年轻恒星的径向速度测量施加的约束。
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