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 ($R\approx20,000$) 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.

中文翻译：

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明亮的光谱双星：I. 周期为 P < 365 天的五个系统的轨道参数

在基于最近发布的 Gaia~DR2 径向速度数据并使用机器人 TIGRE 望远镜进行的有针对性的搜索中，我们发现了 19 颗明亮的 ($m_V<7.66$~mag) 光谱双星。我们展示了其中五颗恒星（HD~20656、HD~27259、HD~98812、HD~150600、HD~193082）的径向速度曲线，周期为$P<365$~天。我们使用工具包 RadVel 确定了它们的轨道参数。主要恒星的全套基本恒星参数（有效温度、表面重力、金属丰度、质量和年龄）是使用观测到的中分辨率光谱（$R\approx20,000$）与 iSpec 以及在具有恒星演化轨迹的 HRD。所有五颗主星都已经进化到巨星阶段并拥有低质量的次级恒星，对光谱没有明显影响。最后，我们确定了双星系统次级恒星的最小质量，并给出了关于双星系统特性的结论。