A5079261868- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Black Holes and Theoretical Physics
- Planetary Science and Exploration
- Advanced Measurement and Detection Methods
- Hydrocarbon exploration and reservoir analysis
- Calibration and Measurement Techniques
- Rocket and propulsion systems research
- Genomics and Phylogenetic Studies
- Machine Learning in Bioinformatics
- Ocean Waves and Remote Sensing
- Metamaterials and Metasurfaces Applications
- High-pressure geophysics and materials
- Orbital Angular Momentum in Optics
Dezhou University
2012-2024
Yale University
2018
Chinese Academy of Sciences
2008-2015
University of Chinese Academy of Sciences
2008
National Astronomical Observatories
2008
Abstract We present an independent validation and comprehensive recalibration of S-PLUS Ultra-short Survey (USS) DR1 12-band photometry using about 30,000–70,000 standard stars from the Best Star (BEST) database. identify spatial variation zero-point offsets, up to 30–40 mmag for blue filters ( u , J 0378, 0395) 10 others, predominantly due higher uncertainties technique employed in original USS calibration. Moreover, we detect large- medium-scale CCD position-dependent systematic errors, 50...
We present an independent validation and comprehensive re-calibration of S-PLUS Ultra-Short Survey (USS) DR1 12-band photometry using about 30,000--70,000 standard stars from the BEst STar (BEST) database. identify spatial variation zero-point offsets, up to 30--40\,mmag for blue filters ($u$, $J0378$, $J0395$) 10\,mmag others, predominantly due higher uncertainties technique employed in original USS calibration. Moreover, we detect large- medium-scale CCD position-dependent systematic...
Abstract We present the analysis of a comprehensive sample 352 early-type galaxies using public data, to investigate correlations between CO luminosities and mid-infrared observed by Wide-field Infrared Survey Explorer. find strong both (1–0) (2–1) 12 μ m luminosity, boasting correlation coefficient greater than 0.9 an intrinsic scatter smaller 0.1 dex. The consistent slopes for relationships suggest that line ratio R 21 lacks with emission in galaxies, which is significantly different from...
Asteroid shape inversion using photometric data has been a key area of study in planetary science and astronomical research. Specifically, researchers have focused on developing techniques to reconstruct 3D asteroid shapes from light curves. This process is crucial for gaining deeper insights into the formation evolution asteroids, as well planning human space missions. However, current methods require extensive iterative calculations, making time-consuming prone becoming stuck local optima....
A functional metasurface of both transparent medium slices and multiple deflection prisms is proposed, where phase retardations for generating non-diffracting vortex lattices are integrated encoded as rotation angles nano-apertures. Under plane-wave illumination, the transmitted waves from thin flat act analogously beams, each with a designed propagating direction pre-scribed shift, that generate an optical lattice within their overlapping region space. By altering design parameters...
In recent years, the rapid development of exoplanet research has provided us with an opportunity to better understand planetary systems in universe and search for signs life. order further investigate prevalence habitable exoplanets validate formation theories, as well comprehend evolution, we have utilized confirmed data obtained from NASA Exoplanet Archive database, including released by telescopes such Kepler TESS. By analyzing these data, selected a sample planets around F, G, K, M-type...
Context. Asteroseismology is an effcient tool not only for testing stellar structure and evolutionary theory but also constraining the parameters of stars which solar-like oscillations are detected, presently. As important southern asteroseismic target, Tau Ceti, a metal-poor star. The main features some frequencies ? Ceti have been identified. Many scientists propose to comprehensively observe this star as part Stellar Observations Network Group. Aims. Our goal obtain optimal model reliable...
The "bump" is a prominent feature of the red giant branch (RGB) luminosity function stellar clusters. Through constructing grid models with different masses and metallicities to study RGB bump we find that increases almost monotonically increasing mass for given metallicity decreases metallicity. Moreover, stars have shapes bump. It correlated sharpness H discontinuity, which left over by convection envelope during first dredge-up. Using periodicity in small separations d01, d10 probe...
<i>Aims. <i/>Element diffusion is a basic physical element transport mechanism which induces the redistribution of chemical elements. Using asteroseismic method, we study effects helium and heavy on internal structure stellar evolution solar-type stars. We also provide parameters for grid models would be useful direct comparison with <i>Kepler<i/> mission observations.<i>Methods. <i/>We construct various masses (from 0.8 to 1.2 ) metallicities (<i>Z<i/><sub><i>i<i/><sub/> = 0.03, 0.025,...
Long gamma-ray bursts (GRBs) are considered to be originated from core collapse of massive stars. It is believed that the afterglow property determined by density material in surrounding interstellar medium. Therefore, circumburst can used distinguish between an wind $n(R) \propto R^{\rm -k}$, and a constant medium (ISM), = const$. Previous studies with different samples, show GRBs neither simply supported wind, nor completely favored ISM. In this work, our new sample consisted 39 smoothly...
Aims. We attempt to develop a new asteroseismic diagram and investigate its characteristics, based on the ratio “r01” of adjacent, average, small separations.
Abstract We first derive the stellar population properties: age and metallicity for ∼43,000 low redshift galaxies in DR7 of Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey, which have no spectroscopic observations Sloan Digital Survey (SDSS). employ a fitting procedure based on small-scale features galaxy spectra so as to avoid possible biases from uncertain flux calibration LAMOST spectroscopy. show that our algorithm can successfully recover average populations...
Abstract We analyzed the optical monitoring data in R band of TeV blazar 1ES 1959+650 from 2002 to 2018, and provided evidence a quasi-periodic oscillation this object. The light curve shows stable persistent periodicity at ∼540 days, detected by Lomb–Scargle periodogram, Jurkevich weighted wavelet z-transform techniques. red noise power spectrum was estimated using PSRESP method, period found be >3 σ significance level. There are also two possible periodicities ∼268 ∼1100 days all three...
HD 176465 is a binary system whose both components are solar-like pulsators and oscillation frequencies were observed by the \kepler\ mission. In this paper we have modeled asteroseismic spectroscopic data of stars, determined their convection-zone helium abundances using signatures left He{\sc ii} ionization zone on mode frequencies. As expected find that same age within uncertainties ($3.087 \pm 0.580$ Gyr $3.569 0.912$ Gyr); they also initial abundance (Y$_{\mathrm{init}}$=0.253 $\pm$...
We report the results of time series analysis blazar PKS 1440-389, observed by Transiting Exoplanet Survey Satellite (TESS) in two sectors. find that source has a quasi-periodic oscillation (QPO) about 3.1 days for sector 11 and around 3.7 38 optical band. use methods to assess QPO its confidence level: Lomb–Scargle periodogram weighted wavelet Z-transforms. explore various potential explanations these rapid variations propose their most likely resides within innermost region accretion disk....
Taking into account the helium and metal diffusion, we explore possible evolutionary status perform seismic analysis of MOST target: star ǫ Eridani.We adopt different input parameters to construct models by fitting available observational constraints: e.g., T ef f , L, R, [F e/H].From computation, obtain average large spacings Eridani about 194 ± 1µHz.The age diffused has been found be 1 Gyr, which is younger than one determined previously without diffusion.We that effect pure diffusion on...
Taking into consideration the effects of rotation and interior magnetic field during lifetime star, we reconstruct model α Cen B to satisfy latest non-asteroseismic asteroseismic observational constraints. We find that can induce a change about 0.3 μHz in large frequency spacings speed up star's evolution. The has thereby been improved.