两个色球活动双星系统：V789 Mon和GZ Leo的多波长光学观测
Multiwavelength optical observations of two chromospherically active binary systems: V789 Mon and GZ Leo
摘要：
本文描述了两颗具有强H_α发射的X射线/EUV选择活动双星V789 Mon（2RE J0725 - 002）和GZ Leo（2RE J1101 + 223）色球的多波长光学研究。这项研究的目标是确定色球活动双星系统的径向速度和基本恒星参数，以便将它们纳入活动-自转和活动-年龄关系。我们进行了高分辨率阶梯光谱观测，并应用光谱相减技术，以测量由于色球层的过度发射。对活动指标的详细研究使我们能够描述这些系统中不同色球层特征的存在，并将其纳入更大的活动旋转调查。我们计算了径向速度的系统使用交叉相关与径向速度标准。证实了双谱线光谱的二元性，并改进了两个系统的轨道解。此外，其他恒星的参数，如：光谱类型，投影旋转速度（vsini），和锂LiI 6707.8 AA吸收线的等效宽度进行了测定。
英文摘要：
This paper describes a multiwavelengh optical study of chromospheres in two X-ray/EUV selected active binary stars with strong H_alpha emission, V789 Mon (2RE J0725-002) and GZ Leo (2RE J1101+223). The goal of the study is to determine radial velocities and fundamental stellar parameters in chromospherically active binary systems in order to include them in the activity-rotation and activity-age relations. We carried out high resolution echelle spectroscopic observations and applied spectral subtraction technique in order to measure emission excesses due to chromosphere. The detailed study of activity indicators allowed us to characterize the presence of different chromospheric features in these systems and enabled to include them in a larger activity-rotation survey. We computed radial velocities of the systems using cross correlation with the radial velocity standards. The double-line spectral binarity was confirmed and the orbital solutions improved for both systems. In addition, other stellar parameters such as: spectral types, projected rotational velocities (vsini), and the equivalent width of the lithium LiI 6707.8 AA absorption line were determined.
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