Spectrum disentangling and orbital solution for kappa Dra

Based on a new set of electronic spectra in a relatively wide spectral range (3500-8300 angstrom) and using the methods of spectrum disentangling (code KOREL) and solution of RV curves (code FOTEL), we determined new orbital elements of the binary star kappa Dra. The solution of the radial velocity curves for Balmer and some other strong metallic lines suggested a circular orbit and led to the following orbital elements: period P = 61.555 +/- 0.029 days, epoch of periastron passage T-periast 49980.22 +/- 0.59, RV semi-amplitude K-1 = 6.81 +/- 0.24 km s(-1), and a mass function of f (m) 0.002 M-.. Lines of the secondary were not detected. In addition, moving absorption bumps in the violet peaks of H alpha and H beta lines were found to be phase-locked with the orbital period. Their presence suggests some kind of interaction between the binary components.