论文标题
首字母缩写iv：三个新的，年轻的低质量光谱二进制
ACRONYM IV: Three New, Young, Low-mass Spectroscopic Binaries
论文作者
论文摘要
作为我们寻找附近年轻移动组（YMG）新的低质量成员（YMG）的一部分，我们发现了三个低质量，光谱二进制物，其中两个与任何已知的YMG都不相关。使用高分辨率的光谱法，我们测量了系统的成分和全身径向速度，以及它们的锂吸收和H $α$发射，这都是青年的光谱指标。一个系统（2MASS J02543316-5108313，M2.0+m3.0）我们确认为40个MYR旧的Tuc-Hor移动组的成员，但以前未被发现了其二进制。第二个年轻的二进制（2MASS J0835977-3042306，K5.5+M1.5）与任何已知的YMG都不相匹配，但是每个组件都表现出锂的吸收和较强的H $α$发射指示，指示活跃的积聚，设定了15 myr的高年龄。在文献中假设第三个系统（2MASS J10260210-4105537，M1.0+M3.0）是10 Myr Old TW Hya关联（TWA）的成员，但凭借我们测量的系统性速度，实际上二进制并不是任何已知YMG的一部分。最后一个系统在每个组件中也具有锂的吸收，并且具有强大且可变的H $α$发射，根据锂检测，年龄上限为15 MYR。
As part of our search for new low-mass members of nearby young moving groups (YMG), we discovered three low-mass, spectroscopic binaries, two of which are not kinematically associated with any known YMG. Using high-resolution optical spectroscopy, we measure the component and systemic radial velocities of the systems, as well as their lithium absorption and H$α$ emission, both spectroscopic indicators of youth. One system (2MASS J02543316-5108313, M2.0+M3.0) we confirm as a member of the 40 Myr old Tuc-Hor moving group, but whose binarity was previously undetected. The second young binary (2MASS J08355977-3042306, K5.5+M1.5) is not a kinematic match to any known YMG, but each component exhibits lithium absorption and strong and wide H$α$ emission indicative of active accretion, setting an upper age limit of 15 Myr. The third system (2MASS J10260210-4105537, M1.0+M3.0) has been hypothesized in the literature to be a member of the 10 Myr old TW Hya Association (TWA), but with our measured systemic velocity, shows the binary is in fact not part of any known YMG. This last system also has lithium absorption in each component, and has strong and variable H$α$ emission, setting an upper age limit of 15 Myr based on the lithium detection.
