Kinematics and activity of M dwarfs in LAMOST DR1
Kinematics and activity of M dwarfs in LAMOST DR1
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LAMOST DR1 中 M 矮星的运动学和活动
DOI：
10.1088/1674-4527/15/6/008
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发表时间：
2015
影响因子：
1.8
通讯作者：
Zhang Yong
中科院分区：
文献类型：
--
作者：
Yi Zhen-Ping;Luo A-Li;Zhao Jing-Kun;Song Yi-Han;Pan Jing-Chang;Zhao Yong-Heng;Zhang Yong
本文报道了郭守敬望远镜（又称大天区多目标光纤光谱望远镜-LAMOST）第一次观测到的M矮星的运动学和色球活动。该样本包括71 304 M矮星。测量了它们的光谱类型、径向速度、重要分子带指数和磁活动等基本参数。它们的距离由光谱视差关系确定。还计算了M矮星的空间运动（U，V，W）和银心柱坐标（R，θ，Z）。我们研究速度色散作为从银河平面的高度的函数，并发现，所有三个组件的速度色散增加与高度测量相对于银河平面。对色球活动沿着银道面高度的研究证实，越靠近银道面的M矮星越有可能活跃。我们采用纯运动学的方法从样本中选取薄盘星和厚盘星，然后研究这两个星群在性质上的差异。我们的分析与以前的研究非常一致，并导致更好地了解银河系盘的结构。
We report on the first investigation into kinematics and chromospheric activity of M dwarfs from the Guo Shou Jing Telescope (also called the Large Sky Area Multi-Object Fiber Spectroscopic Telescope–LAMOST) data release one (DR1). The sample comprises 71 304 M dwarfs. Their fundamental parameters such as spectral types, radial velocities, important molecular band indices and magnetic activities are measured. Their distances are determined by a spectroscopic parallax relation. Space motion (U, V, W) and Galactocentric cylindrical coordinates (R, θ, Z) for the M dwarfs are also computed. We examine velocity dispersion as a function of height from the Galactic plane and find that all three components of velocity dispersion increase with height as measured with respect to the Galactic plane. The investigation into chromospheric activities along the height from the Galactic plane confirms that M dwarfs closer to the Galactic plane are more likely to be active. We take a pure kinematical approach to select thin disk stars and thick disk stars from our sample, then to investigate the differences in properties between these two populations. Our analysis is in excellent agreement with previous studies and leads to a better understanding of the structure of the Galactic disk.