Zobrazeno 11 - 20
of 103
pro vyhledávání: '"Du, Cuihua"'
Based on the second Gaia data release (DR2), combined with the LAMOST and APOGEE spectroscopic surveys, we study the kinematics and metallicity distribution of the high-velocity stars that have a relative speed of at least 220 ${\rm km\ s^{-1}}$ with
Externí odkaz:
http://arxiv.org/abs/2010.14279
Akademický článek
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Autor:
Du, Cuihua, Li, Hefan, Yan, Yepeng, Newberg, Heidi Jo, Shi, Jianrong, Ma, Jun, Chen, Yuqin, Wu, Zhenyu
Base on about 4,500 large tangential velocity ($V_\mathrm{tan}>0.75V_\mathrm{esc}$) with high-precision proper motions and $5\sigma$ parallaxes in Gaia DR2 5D information derived from parallax and proper motion, we identify more than 600 high velocit
Externí odkaz:
http://arxiv.org/abs/1907.06348
Autor:
Yan, Yepeng, Du, Cuihua, Liu, Shuai, Li, Hefan, Shi, Jianrong, Chen, Yuqin, Ma, Jun, Wu, Zhenyu
We determined the chemical and kinematic properties of the Galactic thin and thick disk using a sample of 307,246 A/F/G/K-type giant stars from the LAMOST spectroscopic survey and Gaia DR2 survey. Our study found that the thick disk globally exhibits
Externí odkaz:
http://arxiv.org/abs/1906.03875
Based on Sloan Digital Sky Survey (SDSS) photometric data, Gu developed a new Monte-Carlo-based method for estimating the stellar metallicity distribution functions (MDFs). This method enables a more reliable determination of MDFs compared with the c
Externí odkaz:
http://arxiv.org/abs/1905.02880
Based on the second Gaia data release (Gaia DR2) and spectroscopy from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data, we identified 20,089 halo stars kinematically and chemically. The halo streams in the solar neighborho
Externí odkaz:
http://arxiv.org/abs/1902.04702
Based on the second Gaia data (Gaia DR2) and spectroscopy from the LAMOST Data Release 5, we defined the high-velocity (HiVel) stars sample as those stars with $v_{\mathrm{gc}} > 0.85 v_{\mathrm{esc}}$, and derived the final sample of 24 HiVel stars
Externí odkaz:
http://arxiv.org/abs/1812.00559
Based on the first Gaia data release and spectroscopy from the LAMOST Data Release 4, we study the kinematics and chemistry of the local halo stars. The halo stars are identified kinematically with a relative speed of at least 220 km s$^{-1}$ with re
Externí odkaz:
http://arxiv.org/abs/1807.00427
Autor:
Liu, Shuai, Du, Cuihua, Newberg, Heidi Jo, Chen, Yuqin, Wu, Zhenyu, Ma, Jun, Zhou, Xu, Cao, Zihuang, Hou, Yonghui, Wang, Yuefei, Zhang, Yong
We study the metallicity distribution and kinematic properties of 4,680 A/F/G/K-type giant stars with $|z|>$ 5 kpc selected from the LAMOST spectroscopic survey. The metallicity distribution of giant stars with 5 $<|z|\leqslant$ 15 kpc can be describ
Externí odkaz:
http://arxiv.org/abs/1806.10315
Autor:
Ma, Jun, Wang, Song, Wu, Zhenyu, Zhang, Tianmeng, Zou, Hu, Nie, Jundan, Zhou, Zhiming, Zhou, Xu, Peng, Xiyang, Wang, Jiali, Wu, Jianghua, Du, Cuihua, Yuan, Qirong
GC-1 and GC-2 are two globular clusters (GCs) in the remote halo of M81 and M82 in the M81 group discovered by Jang et al. using the {\it Hubble Space Telescope} ({\it HST}) images. These two GCs were observed as part of the Beijing--Arizona--Taiwan-
Externí odkaz:
http://arxiv.org/abs/1705.08587