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We present the results of a radial velocity survey of a sample of Hyadesstars, and discuss the effects of stellar activity on radial velocitymeasurements. The level of radial velocity scatter due to rotational modulationof stellar surface features for the Hyades is in agreement with the predictionsof Saar & Donahue (1997)- the maximum radial velocity rms of up to ~50 m/s,with an average rms of ~16 m/s. In this sample of 94 stars, we find 1 newbinary, 2 stars with linear trends indicative of binary companions, and noclose-in giant planets. We discuss the limits on extrasolar planet detection inthe Hyades and the constraints imposed on radial velocity surveys of youngstars.Comment: To appear in the June 2004 issue of A

Searching for Planets in the Hyades. V. Limits on Planet Detection in the Presence of Stellar Activity