A5054907440- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- Methane Hydrates and Related Phenomena
- Icing and De-icing Technologies
- Surface Modification and Superhydrophobicity
- Geomagnetism and Paleomagnetism Studies
- Pulsars and Gravitational Waves Research
- Organic Electronics and Photovoltaics
- Adhesion, Friction, and Surface Interactions
- Adaptive optics and wavefront sensing
- Plant Growth Enhancement Techniques
- Ga2O3 and related materials
- Electronic and Structural Properties of Oxides
- Composting and Vermicomposting Techniques
- Fluid Dynamics and Heat Transfer
- Real-Time Systems Scheduling
- ZnO doping and properties
- Organic Light-Emitting Diodes Research
- Power Systems and Renewable Energy
Yunnan Observatories
2009-2024
Chinese Academy of Sciences
2014-2024
University of Chinese Academy of Sciences
2010-2024
Tarim University
2024
Quanzhou Normal University
2023
Kunming Institute of Zoology
2019
Beijing Normal University
2017-2018
Institute of Semiconductors
2016
National Astronomical Observatories
2010-2012
Abstract We present the first results of an ensemble and systematic survey oscillation mode variability in pulsating hot B subdwarf (sdB) white dwarf stars observed with original Kepler mission. The satellite provides uninterrupted high-quality photometric data a time baseline that can reach up to 4 yr collected on stars. This is unique opportunity characterize long-term behaviors modes. A modulation amplitude frequency be independently inferred by its fine structure Fourier spectrum, from...
The pulsating DA white dwarfs (ZZ Ceti stars) are $g$-mode non-radial pulsators. Asteroseismology provides strong constraints on their global parameters and internal structure. Since all the falling in ZZ instability strip do pulsate, structure derived from asteroseismology brings knowledge for as a whole group. HS 0507+0434B is one of stars which lies approximately middle we have undertaken detailed asteroseismological study. We carried out multisite observation campaigns 2007 December 2009...
This paper reports the discovery of an Algol system KIC 10736223 that just past rapid mass transfer stage. From light curve and radial-velocity modelling we find to be a detached with less-massive secondary nearly filling its Roche lobe. Based on short-cadence Kepler data, analyzed intrinsic oscillations pulsator identified six secured independent $\delta$ Scuti-type pulsation modes ($f_{1}$, $f_3$, $f_{9}$, $f_{19}$, $f_{42}$, $f_{48}$). We compute two grids theoretical models reproduce...
Abstract We present an analysis of oscillation mode variability in the hot B subdwarf star EPIC 220422705, a new pulsator discovered from ∼78 days K2 photometry. The high-quality light curves provide detection 66 significant independent frequencies, which we identified nine incomplete potential triplets and three quintuplets. Those g- p- multiplets give rotation periods ∼36 29 core at surface, respectively, potentially suggesting slightly differential rotation. derived period spacing 268.5 s...
KUV 11370+4222 is a ZZ Ceti star discovered in 1996, which has not been observed since then. We performed observations for 2010 January. From the Fourier transform spectrum of light curves, 10 independent modes are detected. searched best-fitting model by using periods to match and obtained it with total mass 0.625 Mȯ, effective temperature 950 K, helium fraction hydrogen 10−2.2 10−4.0, respectively. have found triplet frequency split rotation, l = 1 modes. Using shifts, we estimate rotation...
Abstract Based on 2 minutes cadence TESS data, we investigate pulsations of TIC 65138566 and 139729335 discover them to be two new high-amplitude δ Scuti stars with equally spaced g modes. We recognize the radial fundamental mode f 1 = 18.3334 c d −1 first overtone 3 23.6429 for 65138566, identify highest peak 19.0955 as 139729335. For modes, both display a regular period spacing 2413 s. Through detailed seismological analysis, deduce that these period-spacing patterns correspond modes ℓ 1....
ABSTRACT Hot Jupiters, orbiting their host stars at extremely close distances, undergo tidal evolution, with some being engulfed by due to angular momentum exchanges induced forces. However, achieving double synchronization can prolong survival. Using the mesa stellar evolution code, combined magnetic braking model of Matt et al. (2015), we calculate 25 000 models different metallicity and study how attain conditions that trigger long-term synchronization. Our results indicate massive...
Abstract We conduct an asteroseismological analysis on the non-Blazhko ab-type RR Lyrae star EPIC 248846335, employing Radial Stellar Pulsations module of Modules for Experiments in Astrophysics based set stellar parameters. The atmospheric parameters T eff = 6933 ± 70 K, log g 3.35 0.50, and [Fe/H] −1.18 0.14 are estimated from low-resolution spectra LAMOST DR9. luminosity L <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow>...
Bi-site time-series photometric and high-resolution spectroscopic observations were made for the double-mode high-amplitude $\delta$ Scuti star VX\ Hya. The fundamental frequency $f_{0}=4.4763\ \rm{c\ days^{-1}}$, first overtone $f_{1}=5.7897\ days^{-1}}$ 23 harmonics linear combinations of $f_{0}$ $f_{1}$ are detected by pulsation analysis. From data, we get $\rm{[Fe/H] = -0.2\pm0.1\ dex}$. period change rate mode is obtained using Fourier-phase diagram method, which gives value...
Abstract Blue large-amplitude pulsators (BLAPs) are hot low-mass stars that show light variations likely due to radial oscillations driven by iron group opacities. Period changes provide evidence of both secular contraction and expansion among the class. Various formation histories have been proposed, but none completely satisfactory. Zhang et al. proposed merger a helium-core white dwarf with main-sequence star (HeWD+MS) can lead some classes subdwarfs. We analyzed these HeWD+MS models in...
Based on the two-minutes TESS data, we analyzed intrinsic oscillations of primary component and identified seven confident independent $\delta$ Scuti frequencies ($f_1$, $f_2$, $f_3$, $f_4$, $f_7$, $f_{11}$, $f_{12}$). Both single-star evolutionary models mass-accreting are computed to reproduce freqiencies. Fitting results them match well with each other. The stellar parameters star yielded by asteroseismology $M$ = $1.92^{+0.10}_{-0.02}$ $M_{\odot}$, $Z$ 0.011$^{+0.006}_{-0.001}$, $R$...
We used the light curve code XRBinary to model quiescent K2 curves of three low-inclination cataclysmic variables (CVs): 1RXS J0632+2536 (J0632+2536), RZ Leo, TW Vir and pre-CV WD 1144+011. Optimized models were obtained using a nonlinear fitting NMfit visualized by Phoebe 2.0. The disk shows that one hotspot at edge is enough describe its curve, while other two dwarf nova (DN): Leo require hotspots. A typical with weak irradiation effect for 1144+011 can explain single-hump modulation newly...
Beta-type gallium oxide (β-Ga2O3) is a new attractive material for optoelectronic devices. Different methods had been tried to grow high quality β-Ga2O3 crystals. In this work, crystal growth of Ga2O3 has carried out by chemical vapor transport (CVT) method in closed quartz tube using C as agent and sapphire wafer seed. The CVT mass flux analyzed theoretical calculations based on equilibrium thermodynamics 1D diffusional transport. experimental results are agreement with the predictions....
Abstract SDSS J111215.82+111745.0 is the second pulsating extremely low-mass white dwarf discovered. Two short-period pulsations, 107.56 and 134.275 s, were detected on this star, which would be first observed pressure mode ( p -mode) pulsations a dwarf. While two potential -modes have yet to confirmed, they make an interesting object. In work, we analyzed whole set of seven periods J111215.82+111745.0. We adopt three independent period-spacing tests reveal roughly 93.4 s mean period spacing...
We present 83 new times of maximum light the SX Phoenicis (SX Phe) star DY Pegasi (DY Peg), based mainly on our time-series photometric observations from years 2004–2008. Together with in literature, a comprehensive study theO - C diagram data spanning over seven decades leads to general ephemeris formula and determination value updated period 0.072926187( ± 3)d. The available can be well modeled either triple linear fit, or fit concerning continuously increasing change combined light-time...
Observations for the $\delta$ Scuti star AN Lyn have been made between 2008 and 2016 with 85-cm telescope at Xinglong station of National Astronomical Observatories China, 84-cm SPM Observatory Mexico Nanshan One meter Wide field Telescope Xinjiang China. Data in $V$ 50 nights $R$ 34 are obtained total. The bi-site observations from both Station 2014 analyzed Fourier Decomposition to detect pulsation frequencies. Two independent frequencies resolved, including one non-radial mode. A number...
ABSTRACT Mixed modes are less affected by the surface effect and carry internal information of a star. Asteroseismic modelling mixed can constrain size helium core Previous work has shown that evolution stage KIC 9970396 may be near red giant bump phase, which is one most interesting regions in stage. It known there clear relation between mass luminosity, following homological principles on low-luminosity branch. Our aim this paper to determine structure approach first identify p-dominated...
Based on 2-minute cadence TESS data, we investigate pulsations of TIC 65138566 and 139729335 discover them to be two new HADS stars with equally spaced g modes. We recognize the radial fundamental mode $f_1$ = 18.3334 c/d first overtone $f_3$ 23.6429 for 65138566, identify highest peak 19.0955 as 139729335. For modes, both display a regular period spacing 2413 s. Through detailed seismological analysis, deduce that these patterns correspond modes $\ell$ 1. Moreover, our analysis reveals...