THE STELLAR KINEMATICS IN THE SOLAR NEIGHBORHOOD FROM LAMOST DATA

	THE STELLAR KINEMATICS IN THE SOLAR NEIGHBORHOOD FROM LAMOST DATA
	Tian, Hai-Jun1,2 ; Liu, Chao2 ; Carlin, Jeffrey L.3,4; Zhao, Yong-Heng2 ; Chen, Xue-Lei2 ; Wu, Yue2 ; Li, Guang-Wei2 ; Hou, Yong-Hui 5; Zhang, Yong 5
刊名	ASTROPHYSICAL JOURNAL
	2015-08-20
卷号	809 期号:2
关键词	Galaxy: disk Galaxy: evolution Galaxy: fundamental parameters Galaxy: kinematics and dynamics solar neighborhood
英文摘要	We use about 200,000 FGK-type main-sequence stars from the LAMOST DR1 data to map the local stellar kinematics. With the velocity deprojection technique, we are able to derive the averaged three-dimensional velocity and velocity ellipsoids using only the line-of-sight velocity for the stars with various effective temperatures within 100 < vertical bar z vertical bar < 500 pc. Using the mean velocities of the cool stars, we derive the solar motion of (U-circle dot, V-circle dot, W-circle dot) = (9.58 +/- 2.39, 10.52 +/- 1.96, 7.01 +/- 1.67) km s(-1) with respect to the local standard of rest. Moreover, we find that the stars with T-eff > 6000 K show a net asymmetric motion of similar to 3 km s(-1) in < W > compared to the stars with T-eff < 6000 K. And their azimuthal velocity increases when vertical bar z vertical bar increases. This peculiar motion in the warmer stars is likely because they are young and not completely relaxed, although other reasons, such as the resonance induced by the central rotating bar or the spiral structures. and the perturbation of the merging dwarf galaxies, cannot be ruled out. The derived velocity dispersions and cross-terms for the data are approximately consistent with previous studies. We also find that the vertical gradients of sigma(U) and sigma(V) are larger than that of sigma(W). And the vertical gradient of sigma(U) shows a clear correlation with T-eff, while the other two do not. Finally, our sample shows a vertex deviation of about 11 degrees at 300 < vertical bar z vertical bar < 500 pc, but roughly zero at 100 < vertical bar z vertical bar < 300 pc.
收录类别	SCI
语种	英语
WOS记录号	WOS:000361655100038
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5574]
专题	国家天文台_光学天文研究部
作者单位	1.China Three Gorges Univ, Yichang 443002, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 3.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA 4.Earlham Coll, Dept Phys & Astron, Richmond, IN 47374 USA 5.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Tian, Hai-Jun,Liu, Chao,Carlin, Jeffrey L.,et al. THE STELLAR KINEMATICS IN THE SOLAR NEIGHBORHOOD FROM LAMOST DATA[J]. ASTROPHYSICAL JOURNAL,2015,809(2).
APA	Tian, Hai-Jun.,Liu, Chao.,Carlin, Jeffrey L..,Zhao, Yong-Heng.,Chen, Xue-Lei.,...&Zhang, Yong.(2015).THE STELLAR KINEMATICS IN THE SOLAR NEIGHBORHOOD FROM LAMOST DATA.ASTROPHYSICAL JOURNAL,809(2).
MLA	Tian, Hai-Jun,et al."THE STELLAR KINEMATICS IN THE SOLAR NEIGHBORHOOD FROM LAMOST DATA".ASTROPHYSICAL JOURNAL 809.2(2015).