Solar Neighborhood Kinematics from Gaia?LAMOST Dwarf Stars

被引：3

作者：

Ding, P-J ^{[1
,2
]}

Zhu, Z. ^{[1
,2
]}

Liu, J-C ^{[1
,2
]}

机构：

[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China

[2] Nanjing Univ, Key Lab Modem Astron & Astrophys, Minist Educ, Nanjing 210023, Jiangsu, Peoples R China

来源：

ASTRONOMICAL JOURNAL | 2019年 / 158卷 / 06期

基金：

中国国家自然科学基金;

关键词：

GALACTIC KINEMATICS; SPIRAL ARMS; EVOLUTION; GALAXY; DIFFUSION; MOTIONS;

D O I：

10.3847/1538-3881/ab5111

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use high-precision kinematic data from Gaia data release 2 (DR2) and spectroscopic data from Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) data release 5 (DR5) to explore the kinematics of solar neighborhood dwarf stars in the northern and southern sides of the Galactic plane. The metallicity range of the sampled stars is -0.5[Fe/H] 0.5. Systematic north?south asymmetries in stellar radial motion and rotation are detected: stars in the north disk are moving toward the outer disk, while stars in the south disk have inward-streaming motion toward the Galactic center; stars in the north disk rotate slower than stars in the south disk in general. The tilt angle is antisymmetric about the Galactic plane: for an assumed Galactocentric distance of the Sun, R-0 8.122 kpc, the increase in the tilt angle alpha(Rz) with the vertical distance z is well described by the relation. The variation of stellar kinematics with the vertical distance to the Galactic plane has no essential dependence on the metallicity.

引用

页数：10

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