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Spectrum Disentangling and Orbital Solution for κ Dra
Authors:S M Saad  J Kubát  P Hadrava  P Harmanec  P Koubský  P ?koda  M ?lechta  D Kor?áková  S Yang
Institution:(1) Astronomicky ústav AV čR, CZ-251 65 Ondřejov, Czech Republic;(2) National Research Institute of Astronomy and Geophysics, 11421 Helwan, Cairo, Egypt;(3) Astronomicky ústav UK, V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic;(4) Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 3P6, Canada
Abstract:Based on a new set of electronic spectra in a relatively wide spectral range (3500–8300 Å) 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 κ 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 Hα and Hβ lines were found to be phase-locked with the orbital period. Their presence suggests some kind of interaction between the binary components.
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