A5045620917- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Lipid Membrane Structure and Behavior
- Random lasers and scattering media
- High-pressure geophysics and materials
- Advanced Chemical Physics Studies
- Astronomical and nuclear sciences
- Optical Coherence Tomography Applications
- Advanced Optical Imaging Technologies
- Solar and Space Plasma Dynamics
- Surfactants and Colloidal Systems
- Nanopore and Nanochannel Transport Studies
- Space Exploration and Technology
- Erythrocyte Function and Pathophysiology
- Sphingolipid Metabolism and Signaling
China West Normal University
2014-2024
Beijing Normal University
2017-2022
Zhejiang University
2022
Columbia University
2017
Phase \RNum{2} of the LAMOST-{\sl Kepler/K}2 survey (LK-MRS), initiated in 2018, aims at collecting medium-resolution spectra ($R\sim7,500$; hereafter MRS) for more than $50,000$ stars with multiple visits ($\sim60$ epochs) over a period 5 years (2018 September to 2023 June). We selected 20 footprints distributed across {\sl Kepler} field and six K}2 campaigns, each plate containing number ranging from $\sim2,000$ $\sim 3,000$. During first year observations, LK-MRS has already collected...
Radial velocity is one of key measurements in understanding the fundamental properties stars, stellar clusters and Galaxy. A plate stars Kepler field were observed May 2018 with medium-resolution spectrographs LAMOST, aiming to test performance this new system which upgraded equipment LAMOST after first five-year regular survey.We present our analysis on radial (RVs) derived from these data. The results show that slight significant systematic errors exist among RVs obtained spectra collected...
Abstract We conducted an analysis of the abundances He, C, and N in 210 He-rich hot subdwarfs observed within both Gaia Data Release 3 (DR3) LAMOST DR7 data sets. This involved fitting spectra with Tlusty/Synspec non-LTE synthetic spectra. By examining Galactic spatial positions, velocity vectors, orbital parameters these stars, we determined their population memberships utilizing radial velocities DR3 parallaxes along proper motions. Our investigation revealed two positive correlations C...
The LAMOST-Kepler (LK-) project was initiated to use the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) make spectroscopic follow-up observations for targets in field of Kepler mission. is divided into 14 subfields that are adapted LAMOST circular with a diameter 5 degrees. During regular survey phase LAMOST, LK-project took data from 2012 June 2017 and covered all at least twice. In particular, we describe this paper second Data Release LK-project, including spectra...
Abstract Utilizing Gaia data from the literature, we report a new young (∼8.9 Myr) cluster pair, ASCC 19 and 21, located near Orion star-forming complex. The clusters are separated by 3D distance of 27.00 ± 7.51 pc. Both share common age (Log(age) = 6.95 0.05), similar radial velocities (RV 21.34 4.47 km s −1 for RV 20.05 3.86 21), comparable metallicities ([Fe/H] −0.14 0.25 dex [Fe/H] −0.12 0.04 LAMOST-DR11). These similarities suggest that likely originated fragmentation same molecular...
The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST)-K2 (LK2) project, initiated in 2015, aims to collect low-resolution spectra of targets the K2 campaigns, similar LAMOST-Kepler project. By end 2018, a total 126 LK2 plates had been observed by LAMOST. After cross-matching catalog LAMOST data release 6 (DR6) with that approved targets, we found 160,619 usable 84,012 objects, most which more than once. effective temperature, surface gravity, metallicity, and radial velocity...
We present a photometric study of the short-period eclipsing binary NSVS4484038. Time-series CCD photometry star in B and V band was carried out. An orbital period 0.218551 days determined for revised linear ephemeris given. The first solution system detected through light-curve synthesis using Wilson–Devinney method. It reveals an overcontact configuration with filling-out factor about 10%. mass ratio to be 2.74 inclination 721. less massive secondary component is found have higher surface...
Abstract We investigate a short-period ( P ≈ 4.4 days) eclipsing binary KIC 8301013 using high-quality Kepler photometry and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic data. Through light-curve radial-velocity synthesis Wilson–Devinney method, it reveals that is an almost circular e 0.001), detached system composed of two late F-type main-sequence stars, with masses radii <?CDATA ${M}_{1}=1.29\pm 0.02{M}_{\odot }$?> , R 1 = 1.45 ± 0.01 ⊙ M 2 1.11...
The current work is the first contribution from 50 cm Binocular Network, whose primary goal to systematically detect and characterize variable stars in Galactic open clusters. In this paper, we report results of a search for variables cluster NGC 2301. Eighteen including 12 new objects were detected 20' × field around cluster. physical properties, classifications, memberships are discussed using behaviors light curves, positions on color–magnitude diagram, archival proper-motion data. Among...
Photometric observations of AH Cnc, a W UMa-type system in the open cluster M67, were carried out by using 50BiN telescope. About 100 h time-series B- and V -band data taken, based on which eight new times light minima determined. By applying Wilson-Devinney method, curves modeled revised photometric solution binary was derived. We confirmed that Cnc is deep contact (f = 51%), low mass-ratio (q 0.156) system. Adopting distance modulus derived from study host cluster, we have re-calculated...
ABSTRACT We study the detached eclipsing binary, KIC 5359678, with starspot modulation using high-quality Kepler photometry and LAMOST spectroscopy. The phoebe model, optimal for this reveals that system is a circular composed of two F-type main-sequence stars. masses radii primary secondary are M1 = 1.31 ± 0.05 M⊙, R1 1.52 0.04 R⊙, M2 1.12 R2 1.05 0.06 respectively. age binary estimated to be about 2 Gyr, value much longer than synchronization time-scale 17.8 Myr. residuals light curves...
The spotted detached eclipsing binary (DEB) offers insights into starspots on the binary. Three DEBs, KIC 8097825, 6859813, and 5527172, which were observed by Kepler photometry LAMOST spectroscopy, are studied in this work. physical parameters of binaries determined modeling. sizes, lifetimes, single/double-dip ratio (SDR) derived starspot analysis. 8097825 has large starspots. 6859813 a spot rotation period shorter than its orbital but system should be synchronized inferred from timescale...
A lensless camera is an imaging system that uses a mask in place of lens, making it thinner, lighter, and less expensive than lensed camera. However, additional complex computation time are required for image reconstruction. This work proposes deep learning model named Raw3dNet recognizes hand gestures directly on raw videos captured by without the need restoration. In addition to conserving computational resources, reconstruction-free method provides privacy protection. novel end-to-end...
Abstract We present comprehensive photometric and spectroscopic study of the short-period eclipsing binary KIC 7284688 based on Kepler, TESS, LAMOST data. The radial-velocity analysis indicates that it is a triple-lined system composed nearly equal-mass plus line-of-sight star. masses radii components in are measured to be M 1 = 1.142 ± 0.020 ⊙ , R 1.204 0.051 2 1.119 0.019 1.149 0.052 . In addition eclipses, light curves exhibit rapidly changing O’Connell effect, namely inequality maxima,...
The shape equation and linking conditions for a vesicle with two phase domains are derived. We refine the conjecture on general neck condition limit of budding proposed by J\"ulicher Lipowsky [Phys. Rev. Lett. 70, 2964 (1993); Phys. E 53, 2670 (1996)], then we use to prove that this holds not only axisymmetric vesicles, but also asymmetric ones. Our study reveals mean curvature at any point membrane segments adjacent satisfies when length scale is much larger than characteristic size still...
Abstract We carried out a photometric and spectroscopic analysis for the eclipsing binary TIC 157376469 using TESS LAMOST data. A new linear ephemeris is given. By fitting light curves radial velocity with Wilson–Devinney code, it apperas that composed of two K -type main-sequence stars. The orbit slightly eccentric ( <?CDATA $e\approx 0.0017$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>e</mml:mi> <mml:mo>≈</mml:mo> <mml:mn>0.0017</mml:mn>...
Data representing 864 times of light maxima the high-amplitude δ Scuti star CY Aqr were collected from literature, based on which, long-term period changes variable investigated. A revised and new ephemerides given for pulsating star. Remarkable cyclic variations found in O – C residuals which can be attributed to light-time effects due probable unseen components object. By using Kopal's method, orbital parameters supposed component stars derived. The solution suggests that is very probably...
We present a time-series BV CCD photometry for an EB-type eclipsing binary NSVS 1908107, member of the young open cluster NGC 869. The photometric solution was obtained by using 2003 version Wilson-Devinney code. It reveals that system is semi-detached with secondary component filling its Roche lobe. mass ratio determined to be 0.059±0.001. With physical parameters cluster, masses, radii and luminosities two components 1908107 are estimated M1 = 10.34±2.29 M⊙, R1 4.65±0.34 R⊙, L1 8076±371 L⊙...
Lipid membrane is a continuous barrier between cell and organelle, providing relatively separate room for the vital biological reaction to take place guarantee substance, energy information exchange cells organelles. Helfrich proposed spontaneous curvature model describe free of lipid bilayer. This article reviews equations describing equilibrium morphologies closed membranes with edge based on model, some analytic solutions are provided as well. The practicality proving linking condition...
Context. Tidal deformation breaks the axisymmetric structure of stars, and this may affect stellar activity. This effect has been demonstrated in theoretical analyses simulations, but it lacks observational support. In paper, we use spot-modulated detached binaries to study tides on We show by analyzing properties spot lifetime, harmonic decay timescale, orbital parameters. Aims. aim explore differences lifetimes between single main mechanisms binaries, correlation parameters lifetimes....
Abstract We present the results of photometric and spectroscopic analyses for triple-lined system KIC 6525196, an eclipsing binary accompanied by a third star. By modeling Kepler light curves radial velocities from LAMOST HIDES observations, absolute parameters are determined. Both components found to be solar-like stars with masses radii M 1 = 1.0286 ± 0.0026 ⊙ , R 1.127 0.008 2 0.9667 0.0024 0.963 0.007 . The mass star is determined 3 0.772 0.010 With out-of-eclipse residuals, we measure...
Abstract Utilizing data from the Transiting Exoplanet Survey Satellite (TESS) and LAMOST, we present a photometric spectroscopic investigation of two new K-type low-mass eclipsing binaries, TIC 56913729 97729372. Our analysis yields masses radii for 56913729, M 1 = 0.7822 ± 0.0054 ⊙ , R 0.7891 0.0021 2 0.7532 0.0052 0.7648 . For 97729372, results are 0.6410 0.0058 0.6537 0.0069 0.6480 0.6418 0.0062 In addition, by analyzing out-of-eclipse starspot light variations, lower limit coverage...