862 citations · 5.7k across the 135 of their papers we have counts for
22 papers · 1 filter
Age-metallicity dependent stellar kinematics of the Milky Way disc from LAMOST and Gaia
Yaqian Wu, Maosheng Xiang, Yuqin Chen +5
We investigate the stellar kinematics of the Galactic disc in 7 13\,kpc using a sample of 118\,945 red giant branch (RGB) stars from LAMOST and Gaia. We characterize th…
Nearly 30,000 late-type main-sequence stars with stellar age from LAMOST DR5
Jiajun Zhang, Jingkun Zhao, Terry D. Oswalt +3
We construct a sample of nearly 30,000 main-sequence stars with 4500K 5000K and stellar ages estimated by the chromospheric activityage relation. This sample is u…
Interstellar Extinction and Elemental Abundances
W. B. Zuo, Aigen Li, Gang Zhao
Elements in the interstellar medium (ISM) exist in the form of gas or dust. The interstellar extinction and elemental abundances provide crucial constraints on the composition, siz…
Estimating Atmospheric Parameters of DA White Dwarf Stars with Deep Learning
Yong Yang, Jingkun Zhao, Jiajun Zhang +2
The determination of atmospheric parameters of white dwarf stars (WDs) is crucial for researches on them. Traditional methodology is to fit the model spectra to observed absorption…
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…
Most Lithium-rich Low-mass Evolved Stars Revealed as Red Clump stars by Asteroseismology and Spectroscopy
Hong-Liang Yan, Yu-Tao Zhou, Xianfei Zhang +19
Lithium has confused scientists for decades at almost each scale of the universe. Lithium-rich giants are peculiar stars with lithium abundances over model prediction. A large frac…
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…
Cosmological Insights into the Early Accretion of \textit{r}-Process-Enhanced stars. I. A Comprehensive Chemo-dynamical Analysis of LAMOST J1109+0754
Mohammad K. Mardini, Vinicius M. Placco, Yohai Meiron +10
This study presents a comprehensive chemo-dynamical analysis of LAMOST J1109+0754, a bright (V = 12.8), extremely metal-poor (\abund{Fe}{H} = ) star, with a strong \textit{r…
Searching for r-process-enhanced stars in the LAMOST Survey I: The Method
Tian-Yi Chen, Jian-Rong Shi, Timothy C. Beers +5
The abundance patterns of -process-enhanced stars contain key information required to constrain the astrophysical site(s) of -process nucleosynthesis, and to deepen our under…
Comparisons of Different Fitting Methods for the Physical Parameters of A Star Cluster Sample of M33 with Spectroscopy and Photometry
Zhou Fan, Bingqiu Chen, Xiaoying Pang +8
Star clusters are good tracers for formation and evolution of galaxies. We compared different fitting methods by using spectra (or by combining photometry) to determine the physica…
Discovery of ubiquitous lithium production in low-mass stars
Yerra Bharat Kumar, Bacham E. Reddy, Simon W. Campbell +3
The vast majority of stars with mass similar to the Sun are expected to only destroy lithium over the course of their lives, via low-temperature nuclear burning. This has now been…
Central velocity dispersion catalog of LAMOST-DR7 galaxies
Nicola R. Napolitano, Giuseppe D'Ago, Crescenzo Tortora +6
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) is a major facility to carry out spectroscopic surveys for cosmology and galaxy evolution studies. The sevent…
Stellar activity with LAMOST. III. Temporal variability pattern in Pleiades, Praesepe, and Hyades
Xiang-Song Fang, Christian Moni Bidin, Gang Zhao +2
We present the results from a systematic study of temporal variation of stellar activity in young late-type stars. We used multi-epoch LAMOST low-resolution spectra of over 300 mem…
Neon Abundances of B-stars in the Solar Neighborhood
Sofya Alexeeva, Tianxiang Chen, Tatyana Ryabchikova +4
We constructed a comprehensive model atom for NeI -- NeII using the most up-to-date atomic data available and evaluated the non-local thermodynamic equilibrium (NLTE) line formatio…
The backbone-residual model. Accurately characterising the instrumental profile of a fibre-fed echelle spectrograph
Zhibo Hao, Huiqi Ye, Jian Han +14
Context: Instrumental profile (IP) is the basic property of a spectrograph. Accurate IP characterisation is the prerequisite of accurate wavelength solution. It also facilitates ne…
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…
The Rotation Curve, Mass Distribution and Dark Matter Content of the Milky Way from Classical Cepheids
Iminhaji Ablimit, Gang Zhao, Chris Flynn +1
With the increasing numbers of large stellar survey projects, the quality and quantity of excellent tracers to study the Milky Way is rapidly growing, one of which is the classical…
Unbiased Spectroscopic Study of the Cygnus Loop with LAMOST. I. Optical Properties of Emission Lines and the Global Spectrum
Ji Yeon Seok, Bon-Chul Koo, Gang Zhao +1
We present an unbiased spectroscopic study of the Galactic supernova remnant (SNR) Cygnus Loop using the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) DR5. LAM…
A new moving group in the Local Arm
Xilong Liang, Jingkun Zhao, Yuqin Chen +5
We present a new moving group clustered in kinematics, spatial position and elemental abundances. Its spatial position is around the center of the Local Arm of the Milky Way. A con…
Is NGC 5824 the Core of the Progenitor of the Cetus Stream?
Jiang Chang, Zhen Yuan, Xiang-Xiang Xue +5
A large number of new members (150) of the Cetus Stream (CS) were identified from their clustering features in dynamical space using 6D kinematic data by combining LAMOST DR5…
Local Group Analogs in CDM cosmological simulations
Meng Zhai, Qi Guo, Gang Zhao +2
We use semi-analytic galaxy catalogs based on two high-resolution cosmological -body simulations, Millennium-WMAP7 and Millennium-II, to investigate the formation of the Local G…