Low-amplitude and long-period radial velocity variations in giants HD 3574, 63 Cygni, and HD 216946⋆,⋆⋆
1 Korea Astronomy and Space Science Institute, 776 Daedeokdae-Ro, Youseong-Gu, 305-348 Daejeon, Korea
e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org
2 Department of Astronomy and Atmospheric Sciences, Kyungpook National University, 702-701 Daegu, Korea
3 Thüringer Landessternwarte Tautenburg (TLS), Sternwarte 5, 07778 Tautenburg, Germany
Received: 9 May 2013
Accepted: 15 May 2014
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-1, respectively.
Key words: brown dwarfs / stars: late-type / techniques: radial velocities / stars: individual: HD 3574 / stars: individual: 63 Cygni / stars: individual: HD 216946
Based on observations made with the BOES instrument on the 1.8 m telescope at Bohyunsan Optical Astronomy Observatory in Korea.
Tables 2−4 are available in electronic form at http://www.aanda.org
© ESO, 2014