  Aims. We study the low-amplitude and long-period variations in evolved stars
using precise radial velocity measurements. Methods. The high-resolution,
fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) was used from
September 2004 to May 2014 as part of the exoplanet search program at the
Bohyunsan Optical Astronomy Observatory (BOAO). Results. We report the
detection of low-amplitude and long-period orbital radial velocity variations
in three evolved stars, HD 3574, 63 Cyg, and HD 216946. They have periods of
1061, 982, and 1382 days and semi-amplitudes of 376, 742, and 699 m/s,
respectively.
