Nearby M subdwarfs from LAMOST data release 2
Yu Bai;Wen Hou;Xiao Kong;Zhen-Ping Yi;Yi-Han Song;Zhong-Rui Bai;Jian-Nan Zhang;Meng-Xin Wang;Jian-Jun Chen;Xiao-Yan Chen;Ke-Fei Wu;A-Li Luo;Fang Zuo;Yue Wu;Zi-Huang Cao;Yong-Hui Hou;Yue-Fei Wang;Yong Zhang;Georges Comte;Jing-Kun Zhao;Hai-Feng Yang;Yan-Xin Guo;You-Fen Wang;Yin-Bi Li;Bing Du
【期刊名称】《天文和天体物理学研究》 【年(卷),期】2016(016)007
【摘要】We identify 108 M subdwarfs (sdMs) out of more than two hundred thousand M type spectra from the second data release (DR2) of the LAMOST regular survey.This sample,among which 58 members are identified for the first time,includes 33 extreme subdwarfs (esdMs) and 11 ultra subdwarfs (usdMs).The selection is based on the usual ratio of absorption depth of CaH2,CaH3 and TiO5 band systems.We also emphasize the use of the CaH1 band.We provide estimates of spectral subtype (SPT),Lépine metallicity index ζ,effective temperature and [Fe/H].Both
ζ-[Fe/H]
and
SPT-Teff
figures
show
reasonable
consistency;compared to PHOENIX model spectra,average rounded values of [Fe/H] for sdMs,esdMs and usdMs are respectively-0.5,-1 and-1.5.The photometric distances are estimated,indicating that most sources are located within 500 pc of the Sun and 350 pc of the Galactic disk.Velocities
and
3D
Galactic
motions
are
also
briefly
discussed.Among the 108 subdwarfs,seven stars appear to be active
with a significant Hα emission line.The source LAMOST
J104521.52+482823.3 is a white dwarf-M subdwarf binary,while LAMOST J 123045.52+410943.8,also active,exhibits carbon features in red.
【总页数】14页(55-68) 【关键词】
【作者】Yu Bai;Wen Hou;Xiao Kong;Zhen-Ping Yi;Yi-Han Song;Zhong-Rui
Bai;Jian-Nan
Zhang;Meng-Xin
Wang;Jian-Jun
Chen;Xiao-Yan
Chen;Ke-Fei Wu;A-Li Luo;Fang Zuo;Yue Wu;Zi-Huang Cao;Yong-Hui Hou;Yue-Fei Wang;Yong Zhang;Georges Comte;Jing-Kun Zhao;Hai-Feng Yang;Yan-Xin Guo;You-Fen Wang;Yin-Bi Li;Bing Du
【作者单位】Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;School of Mechanical, Electrical & Information Engineering, Shandong University at Weihai, Weihai 264209, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories,
Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences,
Nanjing 210042, China;Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042, China;Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing 210042, China;Aix-Marseille University, CNRS, Institut Pytheas, L.A.M., UMR 7326, 13388, Marseille Cedex, France;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;School of Computer Science and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 【正文语种】英文 【中图分类】
【文献来源】
https://www.zhangqiaokeyan.com/academic-journal-cn_research-astronomy-astrophysics_thesis/0201254255496.html 【相关文献】
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Nearby M subdwarfs from LAMOST data release 2
