In a well-aimed search based on the recently published Gaia DR2 radial velocity data and performed with the robotic TIGRE telescope , we have discovered 19 bright ( m _ { V } < 7.66 mag ) spectroscopic binary stars .
We present the radial velocity curves of five of these stars ( HD 20656 , HD 27259 , HD 98812 , HD 150600 , HD 193082 ) with periods of P < 365 days .
We determined their orbital parameters using the toolkit RadVel .
The complete set of basic stellar parameters ( effective temperature , surface gravity , metallicity , mass and age ) of the primary stars are determined using the observed intermediate resolution spectra ( R \approx 20 , 000 ) with iSpec and a comparison of the position in the HRD with stellar evolution tracks .
All five primary stars have already evolved to the giant phase and possess low-mass secondaries , which do not noticeably affect the spectra .
Finally , we determined the minimum masses of the secondary stars of the binary systems and present conclusions about the properties of the binary systems .