553 citations · 5.8k across the 128 of their papers we have counts for
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Rediscovering the Galactic outer disk with LAMOST data
Chao Liu, Yan Xu, Haifeng Wang +1
From the derived stellar density profile using LAMOST giant stars, we find that the Galactic disk does not show truncation or break, but smoothly transit to the halo from 19 kpc. T…
The age-velocity dispersion relation of the Galactic discs from LAMOST-Gaia data
Jincheng Yu, Chao Liu
We present the age-velocity dispersion relation (AVR) in three dimensions in the solar neighbourhood using 3,564 commonly observed sub-giant/red-giant branch stars selected from LA…
Discovery and Characterization of 3000+ Main-Sequence Binaries from APOGEE Spectra
Kareem El-Badry, Yuan-Sen Ting, Hans-Walter Rix +7
We develop a data-driven spectral model for identifying and characterizing spatially unresolved multiple-star systems and apply it to APOGEE DR13 spectra of main-sequence stars. Bi…
Chemical abundances and ages of the bulge stars in APOGEE high-velocity peaks
Yingying Zhou, Juntai Shen, Chao Liu +17
A cold high-velocity (HV, 200 km/s) peak was first reported in several Galactic bulge fields based on the APOGEE commissioning observations. Both the existence and the natur…
Mira Variable Stars From LAMOST DR4 Data: Emission Features, Temperature Types, and Candidate Selection
Yuhan Yao, Chao Liu, Licai Deng +2
Based on an extensive spectral study of a photometrically confirmed sample of Mira variables, we find a relationship between relative Balmer emission-line strength and spectral tem…
The peculiar in-plane velocities in the outer disc of the Milky Way
Hai-Jun Tian, Chao Liu, Jun-Chen Wan +9
We present the peculiar in-plane velocities derived from the LAMOST red clump stars, which are purified and separated by a novel approach into two groups with different ages. The s…
Torus Models of the Outer Disc of the Milky Way using LAMOST Survey Data
Qiao Wang, Yougang Wang, Chao Liu +2
With a sample of 48,161 K giant stars selected from the LAMOST DR 2 catalogue, we construct torus models in a large volume extending, for the first time, from the solar vicinity to…
Mapping the Milky Way with LAMOST II: the stellar halo
Yan Xu, Chao Liu, Xiang-Xiang Xue +9
The radial number density and flattening of the Milky Way's stellar halo is measured with metal-poor ([Fe/H]) K giants from LAMOST DR3, using a nonparametric m…
Red Clump stars from LAMOST II: the outer disc of the Milky Way
Jun-chen Wan, Chao Liu, Li-cai Deng +1
We present stellar density maps of the Galactic outer disc with red clump stars from the LAMOST data. These samples are separated into younger (mean age ~ 2.7 Gyr) and older (mean…
A Gaia-PS1-SDSS (GPS1) Proper Motion Catalog Covering 3/4 of the Sky
Hai-Jun Tian, Prashansa Gupta, Branimir Sesar +7
We combine Gaia DR1, PS1, SDSS and 2MASS astrometry to measure proper motions for 350 million sources across three-fourths of the sky down to a magnitude of \,. Using po…
The age-kinematical features in the Milky Way outer disk
Chao Liu, Hai-Jun Tian, Jun-Chen Wan
We derive the mean velocity components at various Galactocentric radii from 8 to 14 kpc using about 40,000 red clump stars observed in the LAMOST survey. We find that the vertical…
Determination of robust metallicities for metal-rich red giant branch stars
C. Liu, G. Ruchti, S. Feltzing +1
The study of the Milky Way relies on our ability to interpret the light from stars correctly. This calls for a reinvestigation of how reliably we can determine, e.g., iron abundanc…
The local spiral arm in the LAMOST-Gaia common stars?
Chao Liu, You-Gang Wang, Juntai Shen +7
Using the LAMOST-Gaia common stars, we demonstrate that the in-plane velocity field for the nearby young stars are significantly different from that for the old ones. For the young…
Mapping the Milky Way with LAMOST I: Method and overview
Chao Liu, Yan Xu, Jun-Chen Wan +8
We present a statistical method to derive the stellar density profiles of the Milky Way from spectroscopic survey data, taking into account selection effects. We assume that the se…