  We present a detailed analysis of five bright spectroscopic binary systems
(HD 18665, HD 27131, HD 171852, HD 215550, HD 217427) that have orbital periods
of P < 500 days. We determined the complete set of orbital parameters using the
toolkit RadVel by analyzing the observed radial velocity curves. To study the
properties of the five systems, we also analyzed the intermediate resolution
spectra (R = 20,000) observed with the TIGRE telescope and determined the
stellar parameters of the primary stars using the toolkit iSpec. With Gaia
Early Data Release 3 parallaxes, a correction for interstellar extinction using
the 3D dust map, and bolometric corrections, we placed the stars in the
Hertzsprung-Russell diagram and compared the positions with stellar evolution
tracks calculated with the Eggleton code to determine the masses and ages of
the primary stars. They have all evolved to the giant phase. Finally, we were
able to determine the masses of the secondary stars and to estimate the orbital
inclinations i of the binary systems.
