Abstract We present a sample of 254,882 luminous red giant branch (LRGB) stars selected from the APOGEE and LAMOST surveys. By combining photometric astrometric information Two Micron All Sky Survey Gaia survey, precise distances are determined by supervised machine-learning algorithm: gradient-boosted decision trees. To test accuracy derived distances, member globular clusters (GCs) open used. The tests cluster show precision about 10% with negligible zero-point offsets, for our stars....

Abstract We present a sample of 135,873 RR Lyrae stars (RRLs) with precise photometric metallicity and distance estimates from our newly calibrated P – ϕ 31 R 21 –[Fe/H]/ –[Fe/H] G -band absolute magnitude–metallicity relations. The relations for type RRab RRc are obtained nearly 2700 Gaia-identified RRLs, measurements light curves spectroscopy. Using few hundreds nearby accurate distances estimated the parallax in Gaia Early Data Release 3, new near-IR period–absolute constructed. External...

We present a sample of $\sim$ 140,000 primary red clump (RC) stars spectral signal-to-noise ratios higher than 20 from the LAMOST Galactic spectroscopic surveys, selected based on their positions in metallicity-dependent effective temperature--surface gravity and color--metallicity diagrams, supervised by high-quality $Kepler$ asteroseismology data. The stellar masses ages those are further determined spectra, using Kernel Principal Component Analysis method, trained with thousands RCs...

Abstract Motivated by the vast gap between photometric and spectroscopic data volumes, there is great potential in using 5D kinematic information to identify study substructures of Milky Way. We Galactic halo 46,575 RR Lyrae stars (RRLs) from Gaia Data Release 3, with metallicities distances newly estimated X.-Y. Li et al. Assuming a Gaussian prior distribution radial velocity, we calculate orbital characterized integrals motion for each RRL, based on its 3D positions, proper motions,...

The Energetic Particle Detector (EPD) suite on board Solar Orbiter provides unprecedented high-resolution measurements of suprathermal and energetic particles in interplanetary space. These data can resolve particle dynamics near shocks, offering new insights into acceleration transport processes. We present observations proton bursts downstream an shock discuss possible formation combined from two sensors EPD, the SupraThermal Electron Proton (STEP) sensor Electron-Proton Telescope (EPT),...

Spotted scat ( Scatophagus argus ) is an economically important marine species in China, with high ornamental and edible value. The effects of dietary supplementation Lianjiang red orange peels, a natural carotenoid source, at 0, 3, 6, 9 12%, hereafter referred to as G0, G3, G6, G9 G12, were measured on color values, content, expression genes such cyp2j6 , cyp1a1 hsp70 slc2a11 bco2 cyp26c1 after 4 weeks. Subsequently, the different values (L*, a*, b*), total carotenoids gene pattern...

We investigate the three-dimensional asymmetrical kinematics and present time stamps of Milky Way disk between Galactocentric distances $R=12$ 15 \,kpc, using red clump stars selected from LAMOST Galactic survey, also with proper motion measurements provided by Gaia DR2. discover velocity substructure above plane corresponding to a density dip found recently ("south-middle opposite" structure[R $\sim$ 12-15 Z 1.5 \,kpc] discovered in \citet{Wang2018b, Wang2018c}) radial azimuthal velocity....

ABSTRACT We employ a sample of 135 873 RR Lyrae stars (RRLs) with precise photometric-metallicity and distance estimates from the newly calibrated P–ϕ31–R21–[Fe/H] Gaia G band P–R21–[Fe/H] absolute magnitude–metallicity relations Li et al., combined available proper motions EDR3, 6955 systemic radial velocities DR3 other sources, in order to explore chemistry kinematics halo Milky Way (MW). This is ideally suited for characterization inner- outer-halo populations stellar halo, free bias...

Abstract In this Letter, we report the discovery of an intriguing hypervelocity star (HVS; J1443+1453) candidate that is probably from Sagittarius Dwarf Spheroidal galaxy (Sgr dSph). The old and very metal-poor low-mass main-sequence turn-off (age ∼14.0 Gyr [Fe/H] = −2.23 dex) has a total velocity km s −1 in Galactic rest frame heliocentric distance kpc. J1443+1453 larger than escape speed at its position, suggesting it promising HVS candidate. By reconstructing trajectory potential, find...

In spite of significant progress in the research fast radio bursts (FRBs) recent decade, their origin is still under extensive debate. Investigation on population FRBs can provide new insight into this interesting problem. paper, based first CHIME/FRB catalog, we construct a Bayesian framework to analyze FRB population, with selection effect CHIME telescope being properly taken account. The energy function modeled as power-law an exponential cutoff. Four redshift distribution models are...

With the gradual intensification of competition between e-commerce platforms, people's demand for platforms is also getting higher and higher, differentiation strategy after-sales service system occupies an important position in development path platforms. Therefore, topic this article research on competitive Pinduoduo's system. The method to collate, analyze summarize current literature data research, study advantages Pinduoduo as well problems, provide directions suggestions all major...

Using a sample of nearly 140,000 primary red clump stars selected from the LAMOST and $Gaia$ surveys, we have identified large "young" [$\alpha$/Fe]-enhanced with stellar ages younger than 6.0 Gyr [$\alpha$/Fe] ratios greater 0.15 dex. The are measured spectra, using machine learning method trained common in LAMOST-APOGEE fields (for [$\alpha$/Fe]) LAMOST-$Kepler$ age). existence these is not expected classical Galactic chemical evolution models. To explore their possible origins, analyzed...

ABSTRACT We use 3653 (2661 RRab, 992 RRc) RR Lyrae stars (RRLs) with 7D (3D position, 3D velocity, and metallicity) information selected from Sloan Digital Sky Survey, Large Area Multi-Object Fiber Spectroscopic Telescope, Gaia EDR3, divide the sample into two Oosterhoff groups (Oo I Oo II) according to their amplitude–period behaviour in Bailey diagram. present a comparative study of these based on chemistry, kinematics, dynamics. find that RRLs are relatively more metal-rich, predominately...

Abstract Using a sample of nearly 140,000 red clump stars selected from the LAMOST and Gaia Galactic surveys, we have mapped mean vertical velocity <?CDATA $\overline{{V}_{z}}$?> in X – Y plane for large volume disk (6 &lt; R 16 kpc; −20 ϕ 50°; $| Z| \lt 1$?> kpc). A clear signature where increases with is detected chemically thin disk. The thick disk, however, not significant, line hot nature this component. For warp shows significant variations both radial azimuthal directions, excellent...

Abstract We present a three-dimensional (3D) extinction map of the southern sky. The covers SkyMapper Southern Survey (SMSS) area ∼14,000 deg 2 and has spatial resolutions between 6.′9 27′. Based on multi-band photometry SMSS, Two Micron All Sky Survey, Wide-Field Infrared Explorer Gaia mission, we have estimated values r -band for ∼19 million stars with spectral energy distribution analysis. Together distances calculated from data release (DR2) parallaxes, constructed 3D By combining our...

Deriving atmospheric parameters of a large sample stars is vital importance to understand the formation and evolution Milky Way. Photometric surveys, especially those with near-ultraviolet filters, can offer accurate measurements stellar parameters, precision comparable that from low/medium resolution spectroscopy. In this study, we explore capability measuring CSST broad-band photometry (particularly bands), based on synthetic colors derived model spectra. We find optical filter systems...

Abstract Deriving atmospheric parameters of a large sample stars is vital importance to understand the formation and evolution Milky Way. Photometric surveys, especially those with near-ultraviolet filters, can offer accurate measurements stellar parameters, precision comparable that from low/medium resolution spectroscopy. In this study, we explore capability measuring Chinese Space Station Telescope (CSST) broad-band photometry (particularly in bands), based on synthetic colors derived...

Motivated by the vast gap between photometric and spectroscopic data volumes, there is great potential in using 5D kinematic information to identify study substructures of Milky Way. We Galactic halo 46,575 RR Lyrae stars (RRLs) from Gaia DR3 with metallicities distances newly estimated Li et al. (2023). Assuming a Gaussian prior distribution radial velocity, we calculate orbital characterized integrals motion for each RRL based on its 3D positions, proper motions corresponding errors, then...

We employ a sample of 135,873 RR Lyrae stars (RRLs) with precise photometric-metallicity and distance estimates from the newly calibrated $P$--$\phi_{31}$--$R_{21}$--[Fe/H] $Gaia$ $G$-band $P$--$R_{21}$--[Fe/H] absolute magnitude-metallicity relations Li et al., combined available proper motions EDR3, 6955 systemic radial velocities DR3 other sources, in order to explore chemistry kinematics halo Milky Way (MW). This is ideally suited for characterization inner- outer-halo populations...

We present a sample of 135,873 RR Lyrae stars (RRLs) with precise photometric-metallicity and distance estimates from our newly calibrated $P-ϕ_{31}-R_{21}-$[Fe/H]/$P-R_{21}-$[Fe/H] $G$ band absolute magnitude-metallicity relations. The $P-ϕ_{31}-R_{21}-$[Fe/H] $P-R_{21}-$[Fe/H] relations for type RRab RRc are obtained nearly 2700 Gaia-identified RRLs $ϕ_{31}$ $R_{21}$ measurements the light curves metallicity spectroscopy. Using 236 nearby accurate distances estimated parallax Gaia EDR3,...

We present a sample of 254,882 luminous red giant branch (LRGB) stars selected from the APOGEE and LAMOST surveys. By combining photometric astrometric information 2MASS Gaia surveys, precise distances are determined by supervised machine learning algorithm: gradient boosted decision trees. To test accuracy derived distances, member globular clusters (GCs) open (OCs) used. The tests cluster show precision about 10 per cent with negligible zero-point offsets, for our stars. final covers large...

The Five-hundred-meter Aperture Spherical radio Telescope (FAST) adopts an active deformable main reflector which is composed of 4450 triangular panels. During observation, the illuminated area deformed into a 300-m diameter paraboloid and directed toward source. To achieve accurate control shape, positions 2226 nodes distributed around entire must be measured with sufficient precision within limited time, challenging task because large scale. Measurement FAST makes use stations node...