553 citations · 5.8k across the 128 of their papers we have counts for
14 papers · 1 filter
Detecting shock waves in non-fundamental mode RR Lyrae using large sample of spectra in SDSS and LAMOST
Xiao-Wei Duan, Xiao-Dian Chen, Li-Cai Deng +4
Steps toward the nature inside RR Lyrae variables can not only improve our understanding of variable stars but also innovate the precision when we use them as tracers to map the st…
Possible evidence of hydrogen emission in the first-overtone and multi-mode RR Lyrae variables
Xiao-Wei Duan, Xiao-Dian Chen, Li-Cai Deng +4
The nature of shock waves in non-fundamental mode RR Lyrae stars remains a mystery because of limited spectroscopic observations. We apply a pattern recognition algorithm on spectr…
Understanding the velocity distribution of the Galactic Bulge with APOGEE and Gaia
Yingying Zhou, Zhao-Yu Li, Iulia Simion +5
We revisit the stellar velocity distribution in the Galactic bulge/bar region with APOGEE DR16 and {\it Gaia} DR2, focusing in particular on the possible high-velocity (HV) peaks a…
Detection of the LMC-induced sloshing of the Galactic halo
Denis Erkal, Alis J. Deason, Vasily Belokurov +8
A wealth of recent studies have shown that the LMC is likely massive, with a halo mass . One consequence of having such a nearby and massive neighbour is that the…
The mass of the Milky Way out to 100 kpc using halo stars
Alis J. Deason, Denis Erkal, Vasily Belokurov +9
We use a distribution function analysis to estimate the mass of the Milky Way out to 100 kpc using a large sample of halo stars. These stars are compiled from the literature, and t…
On the radial velocity calibrations in the LAMOST Medium-Resolution Spectroscopic Survey of Nebulae
Juan-Juan Ren, Hong Wu, Chao-Jian Wu +12
Accurate radial velocity determinations of optical emission lines (i.e. [NII]6548,6584, H, and [SII]6717,6731) are very important for investigating the kinematics and dy…
Differential rotation of the halo traced by the K-giant stars
Hao Tian, Chao Liu, Yougang Wang +4
We use K-giant stars selected from the LAMOST DR5 to study the variation of the rotational velocity of the galactic halo at different space positions. Modelling the rotational velo…
Measuring the local dark matter density with LAMOST DR5 and Gaia DR2
Rui Guo, Chao Liu, Shude Mao +3
We apply the vertical Jeans equation to the kinematics of Milky Way stars in the solar neighbourhood to measure the local dark matter density. More than 90,000 G- and K-type dwarf…
LAMOST Medium-Resolution Spectroscopic Survey (LAMOST-MRS): Scientific goals and survey plan
Chao Liu, Jianning Fu, Jianrong Shi +38
Since September 2018, LAMOST starts a new 5-year medium-resolution spectroscopic survey (MRS) using bright/gray nights. We present the scientific goals of LAMOST-MRS and propose a…
Constraints on the assembly history of the Milky Way's smooth, diffuse stellar halo from the metallicity-dependent, radially-dominated velocity anisotropy profiles probed with K giants and BHB stars using LAMOST, SDSS/SEGUE, and Gaia
Sarah A. Bird, Xiang-Xiang Xue, Chao Liu +5
We analyze the anisotropy profile of the Milky Way's smooth, diffuse stellar halo using SDSS/SEGUE blue horizontal branch stars and SDSS/SEGUE and LAMOST K giants. These intrinsica…
Three New Late-type Hypervelocity Star Candidates from Gaia DR2 with Refined Selection Criteria
Jiao Li, Shi Jia, Yan Gao +6
Several dozen hypervelocity star (HVS) candidates have been reported based on the second data release of Gaia (Gaia DR2). However, it has been proven that the radial velocities of…
The extended Gaia-PS1-SDSS (GPS1+) proper motion catalog
Hai-Jun Tian, Yang Xu, Chao Liu +3
The GPS1 catalog was released in 2017. It delivered precise proper motions for around 350 million sources across three-fourths of the sky down to a magnitude of \,mag. In…
Discovery of two nearby post-T Tauri stellar associations
Jiaming Liu, Chao Liu, Min Fang
In this work we report the discovery of 2 new stellar associations in close vicinity of the Sun at roughly 180 and 150 pc. These two associations, named as u Tau assoc and e Tau as…
On the Chemical and Kinematic Consistency Between N-rich Metal-poor Field Stars and Enriched Populations in Globular Clusters
Baitian Tang, J. G. Fernandez-Trincado, Chao Liu +5
Interesting chemically peculiar field stars may reflect their stellar evolution history and their possible origin in a different environment from where they are found now, which is…