Special Issue for LAMOST Sciences

M Dwarf catalog of LAMOST general survey data release one

Yan-Xin Guo, Zhen-Ping Yi, A-Li Luo, You-Fen Wang, Yu Bai, Hai-Feng Yang, Yi-Han Song, Jian-Jun Chen, Xiao-Yan Chen, Fang Zuo, Bing Du, Jian-Nan Zhang, Yin-Bi Li, Xiao Kong, Meng-Xin Wang, Yue Wu, Ke-Fei Wu, Yong-Heng Zhao, Yong Zhang, Yong-Hui Hou, Yue-Fei Wang, Ming Yang


Abstract We present a spectroscopic catalog of 93 619 M dwarfs from the first data release of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) general survey. During sample selection, M giant contamination was eliminated using 2MASS photometry and CaH/TiO molecular indices. For each spectrum, the spectral subtype and values are provided including radial velocity, Hα equivalent width, a series of prominent molecular band indices, and the metal–sensitive parameter ζ, as well as distances and the space motions for high S/N objects. In addition, Hα emission lines are measured to examine the magnetic activity properties of M dwarfs and 7179 active ones are found. In particular, a subsample with significant variation in magnetic activity is revealed through observations from different epochs. Finally, statistical analysis for this sample is performed, including the metallicity classification, the distribution of molecular band indices and their errors.


Keywords catalogs — methods: analytical — stars: statistical — stars : late-type — stars: magnetic-activity — stars

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