LAMOST
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THE ELEVENTH AND TWELFTH DATA RELEASES OF THE SLOAN DIGITAL SKY SURVEY: FINAL DATA FROM SDSS-III Open
The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using the original SDSS wide-field imager, the original and an upgraded multi-object fiber-fed optical spectrograph, a new near-infrared high-resol…
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Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe Open
We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands of Milky Way stars…
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The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar, and APOGEE-2 Data Open
This paper documents the seventeenth data release (DR17) from the Sloan Digital Sky Surveys; the fifth and final release from the fourth phase (SDSS-IV). DR17 contains the complete release of the Mapping Nearby Galaxies at Apache Point Obs…
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The first data release (DR1) of the LAMOST regular survey Open
The Large sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) general survey is a spectroscopic survey that will eventually cover approximately half of the celestial sphere and collect 10 million spectra of stars, galaxies and QSO…
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THE DATA REDUCTION PIPELINE FOR THE SDSS-IV MaNGA IFU GALAXY SURVEY Open
Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) is an optical fiber-bundle integral-field unit (IFU) spectroscopic survey that is one of three core programs in the fourth-generation Sloan Digital Sky Survey (SDSS-IV). With a sp…
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The Pristine survey – I. Mining the Galaxy for the most metal-poor stars Open
We present the Pristine survey, a new narrow-band photometric survey focused on the metallicity-sensitive Ca H&K lines and conducted in the Northern hemisphere with the wide-field imager MegaCam on the Canada-France-Hawaii Telescope. This …
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The LAMOST stellar parameter pipeline at Peking University – lsp3 Open
We introduce the LAMOST Stellar Parameter Pipeline at Peking University ---\nLSP3, developed and implemented for the determinations of radial velocity\n$V_{\\rm r}$ and stellar atmospheric parameters (effective temperature $T_{\\rm\neff}$,…
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The Robotic Multiobject Focal Plane System of the Dark Energy Spectroscopic Instrument (DESI) Open
A system of 5020 robotic fiber positioners was installed in 2019 on the Mayall Telescope, at Kitt Peak National Observatory. The robots automatically retarget their optical fibers every 10–20 minutes, each to a precision of several microns…
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The Xinglong 2.16-m Telescope: Current Instruments and Scientific Projects Open
The Xinglong 2.16-m reflector is the first 2-meter class astronomical\ntelescope in China. It was jointly designed and built by the Nanjing\nAstronomical Instruments Factory (NAIF), Beijing Astronomical Observatory (now\nNational Astronomi…
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LAMOST Spectroscopic Survey of the Galactic Anticentre (LSS-GAC): target selection and the first release of value-added catalogues Open
As a major component of the LAMOST Galactic surveys, the LAMOST Spectroscopic Survey of the Galactic Anti-centre (LSS-GAC) aims to survey a significant volume of the Galactic thin/thick discs and halo for a contiguous sky area of over 3,40…
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Activity indicators and stellar parameters of the<i>Kepler</i>targets Open
The LAMOST-Kepler survey, whose spectra are analyzed in the present paper, is\nthe first large spectroscopic project aimed at characterizing these sources.\nOur work is focused at selecting emission-line objects and chromospherically\nacti…
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Revisiting the Tale of Hercules: How Stars Orbiting the Lagrange Points Visit the Sun Open
We propose a novel explanation for the Hercules stream consistent with recent measurements of the extent and pattern speed of the Galactic bar. We have adapted a made-to-measure dynamical model tailored for the Milky Way to investigate the…
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Statistics of 700 Individually Studied W UMa Stars Open
We present a statistical study of the largest bibliographic compilation of stellar and orbital parameters of W UMa stars derived by light-curve synthesis with Roche models. The compilation includes nearly 700 individually investigated obje…
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Lamost Observations In The Kepler Field. I. Database Of Low-resolution Spectra Open
The nearly continuous light curves with micromagnitude precision provided by the space mission Kepler are revolutionizing our view of pulsating stars. They have revealed a vast sea of low-amplitude pulsation modes that were undetectable fr…
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Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9 R<sub>⊕</sub> Open
Previous measurements of stellar properties for K2 stars in the Ecliptic Plane Input Catalog largely relied on photometry and proper motion measurements, with some added information from available spectra and parallaxes. Combining Gaia DR2…
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Estimating stellar atmospheric parameters, absolute magnitudes and elemental abundances from the LAMOST spectra with Kernel-based principal component analysis Open
Accurate determination of stellar atmospheric parameters and elemental abundances is crucial for Galactic archeology via large-scale spectroscopic surveys. In this paper, we estimate stellar atmospheric parameters -- effective temperature …
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Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. II. Elemental Abundances Open
We present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (VMP) stars based on the LAMOST survey and follow-up observations with the Subaru Telescope. It is the largest high-resolution VMP sample (including 363 …
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TAD: A trajectory clustering algorithm based on spatial-temporal density analysis Open
In this paper, a novel trajectory clustering algorithm - TAD - is proposed to extract trajectory Stays based on spatial-temporal density analysis of data. Two new metrics - NMAST (Neighbourhood Move Ability and Stay Time) density function …
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LAMOST Spectroscopic Survey of the Galactic Anticentre (LSS-GAC): the second release of value-added catalogues Open
We present the second release of value-added catalogues of the LAMOST Spectroscopic Survey of the Galactic Anticentre (LSS-GAC DR2). The catalogues present values of radial velocity $V_{\rm r}$, atmospheric parameters --- effective tempera…
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A Catalog of 10,000 Very Metal-poor Stars from LAMOST DR3 Open
We present the result of a search for very metal-poor (VMP, ) stars in the Milky Way based on low-resolution spectra from Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) DR3, significantly enlarging the current candidate…
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Self-consistent Stellar Radial Velocities from LAMOST Medium-resolution Survey DR7 Open
Radial velocity (RV) is among the most fundamental physical quantities obtainable from stellar spectra and is rather important in the analysis of time-domain phenomena. LAMOST Medium-resolution Survey (MRS) DR7 contains five million single…
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The age–velocity dispersion relation of the Galactic discs from LAMOST–Gaia data Open
We present the age-velocity dispersion relation (AVR) in three dimensions in\nthe solar neighbourhood using 3,564 commonly observed sub-giant/red-giant\nbranch stars selected from LAMOST, which gives the age and radial velocity, and\n\\emp…
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Stellar labels for hot stars from low-resolution spectra Open
We set out to determine stellar labels from low-resolution survey spectra of hot stars, specifically OBA stars with T eff ≳ 7500 K. This fills a gap in the scientific analysis of large spectroscopic stellar surveys such as LAMOST, which of…
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Tracing the <i>Hercules</i> stream with <i>Gaia</i> and LAMOST: new evidence for a fast bar in the Milky Way Open
The length and pattern speed of the Milky Way bar are still controversial. Photometric and spectroscopic surveys of the inner Galaxy, as well as gas kinematics, favour a long and slowly rotating bar, with corotation around a Galactocentric…
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StarHorse results for spectroscopic surveys and <i>Gaia</i> DR3: Chrono-chemical populations in the solar vicinity, the genuine thick disk, and young alpha-rich stars Open
The Gaia mission has provided an invaluable wealth of astrometric data for more than a billion stars in our Galaxy. The synergy between Gaia astrometry, photometry, and spectroscopic surveys gives us comprehensive information about the Mil…
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Application of convolutional neural networks for stellar spectral classification Open
Due to the ever-expanding volume of observed spectroscopic data from surveys such as SDSS and LAMOST, it has become important to apply artificial intelligence (AI) techniques for analysing stellar spectra to solve spectral classification a…
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ASTEROSEISMIC-BASED ESTIMATION OF THE SURFACE GRAVITY FOR THE LAMOST GIANT STARS Open
Asteroseismology is one of the most accurate approaches to estimate the surface gravity of a star. However, most of the data from the current spectroscopic surveys do not have asteroseismic measurements, which is very expensive and time co…
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Mapping the Milky Way with LAMOST– III. Complicated spatial structure in the outer disc Open
We present {complexity} of the Galactic outer disc {by fitting the stellar\nvolume densities of the red giant branch stars with a two-disc component\nmodel}. {The discs are confirmed to} extend to $R\\sim19$\\,kpc. The radial\ndensity prof…
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LAMOST OBSERVATIONS IN THE KEPLER FIELD: SPECTRAL CLASSIFICATION WITH THE MKCLASS CODE Open
The LAMOST - Kepler project was designed to obtain high-quality, low-resolution spectra of many of the stars in the Kepler field with the Large Sky Area Multi Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic telescope. To date 1…
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LAMOST Observations in the Kepler Field. II. Database of the Low-resolution Spectra from the Five-year Regular Survey* Open
The LAMOST- Kepler (LK-) project was initiated to use the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) to make spectroscopic follow-up observations for the targets in the field of the Kepler mission. The Kepler field …