Magnetic field and radial velocities of the star Chi

We present high-resolution spectropolarimetric observations of the spectroscopic binary χDra. Spectral lines in the spectrum of the main component χDraA show variable Zeeman displacement, which confirms earlier suggestions about the presence of a weak magnetic field on the surface of this star. Within about 2 years of time base of our observations, the longitudinal component BL of the magnetic field exhibits variation from −11.5± 2.5G to +11.1± 2.1G with a period of about 23 days. Considering the rotational velocity of χDraA in the literature and that newly measured in this work, this variability may be explained by the stellar rotation under the assumption that the magnetic field is globally stable. Our new measurements of the radial velocities (RV) in high-resolution I-spectra of χDraA refined the orbital parameters and reveal persistent deviations of RVs from the orbital curve. We suspect that these deviations may be due to the influence of local magnetically generated spots, pulsations, or a Jupiter-size planet orbiting the system.