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Spot and Facula Activity Variations of the Eccentric Detached Eclipsing Binary KIC 8098300 Based on the Time-series Orbital Solutions

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Research in Astronomy and Astrophysics 2022年第1期22卷 174-188页

作者： hu-biao niu Jian-Ning Fu Jia-Xin Wang Chun-Qian Li Department of Astronomy Beijing Normal UniversityBeijing 100875China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

The LAMOST spectra and Kepler light curves are combined to investigate the detached eclipsing binary KIC 8098300,which shows the O’Connell effect caused by spot/facula *** radial velocity(RV)measurements are derived by using the tomographic spectra disentangling *** mass ratio q=K1/K2=0.812±0.007,and the orbital semimajor axis a sin i=14.984±0.048 R_(⊙)are obtained by fitting the RV *** optimize the binary model concerning the spot/facula activity with the code PHOEBE and obtain precise parameters of the orbit including the eccentricity e=0.0217±0.0008,the inclination i=87°.71±0°.04,and the angle of periastronω=284°.1±0°.*** masses and radii of the primary and secondary star are determined as M_(1)=1.3467±0.0001 M_(⊙),R_(1)=1.569±0.003 R_(⊙),and M_(2)=1.0940±0.0001 M_(⊙),R_(2)=1.078±0.002 R_(⊙),*** ratio of temperatures of the two component stars is r_(teff)=0.924±*** also obtain the periastron precession speed of 0.000024±0.000001 day *** residuals of out-of-eclipse are analyzed using the auto-correlation function and the discrete Fourier *** spot/facula activity is relatively weaker,but the lifetime is longer than that of most single main sequence stars in the same temperature *** average rotation period of the spots P_(rot)=4.32 days is slightly longer than the orbital period,which may be caused by either the migration of spots/faculae along the longitude or the latitudinal differential *** activity may be spot-dominated for the secondary star and facula-dominated for the primary *** method of this work can be used to analyze more eclipsing binaries with the O’Connell effect in the Kepler field to obtain the precise parameters and investigate the difference of spot behavior between binaries and single *** is helpful for a deeper understanding of the stellar magnetic activity and dynamo theory.

关键词： (stars:)binaries:eclipsing (stars:)starspots stars:individual(KIC 8098300)

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Variable Star Detection in the Field of Open Cluster NGC 188

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Research in Astronomy and Astrophysics 2023年第9期23卷 162-170页

作者： Fang-Fang Song hu-biao niu Ali Esamdin Yu Zhang Xiang-Yun Zeng Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Center for Astronomy and Space Sciences China Three Gorges UniversityYichang 443000China

This work presents the charge-coupled device(CCD)photometric survey of the old open cluster NGC *** V-band photometric observations were conducted for ten nights in 2017 January using the Nanshan Onemeter Wide-field Telescope to search for variable stars in the field of the cluster.A total of 25 variable stars,including one new variable star,were detected in the target *** the detected variables,16 are cluster member stars,and the others are identified as field *** periods,radial velocities,effective temperatures,and classifications of the detected variables are discussed in this *** of the stars’effective temperatures are between 4200 and 6600 K,indicating their spectral types are G or *** newly discovered variable is probably a W UMa *** this study,a known cluster variable star(V21=V0769 Cep)is classified as an EA-type variable star based on the presence of an 0.5 mag eclipse in its light curve.

关键词： (stars )binaries general-stars general-(Galaxy )open clusters and associations individual(NGC 188)-stars variables general

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A study of variable stars in the open cluster NGC 1582 and its surrounding field

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Research in Astronomy and Astrophysics 2016年第10期16卷 35-44页

作者： Fang-Fang Song Ali Esamdin Lu Ma Jin-Zhong Liu Yu Zhang hu-biao niu Tao-Zhi Yang Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China

This paper presents Charge-Coupled Device time-series photometric observations of the open cluster NGC 1582 and its surrounding field with Johnson B, V and R filters by using the Nanshan 1 m telescope administered by Xinjiang Astronomical Observatory. 19 variable stars and three variable candi- dates were detected in a 45＇ - 48.75＇ field around the cluster. 12 of the variable stars are newly-discovered variable objects. The physical properties, classifications and memberships of these 22 objects are studied through their light curves, their positions on the color-magnitude diagram and with archival data from the Naval Observatory Merged Astrometric Dataset. Among these objects, five are eclipsing binary systems, six are pulsating variable stars including one known 6 Scuti star and one newly-discovered RR Lyrae star. The distance to the RR Lyrae star is estimated to be 7.9 - 0.3 kpc, indicating that the star is located far behind the cluster. Four variable stars are probable members of the cluster, and 13 of the 22 objects are confirmed to be field stars.

关键词： NGC 1582 -- open cluster -- variable stars -- multi-color observation -- magnitude

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Pulsations of the High-Amplitude δ Scuti star YZ Bootis

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Research in Astronomy and Astrophysics 2018年第1期18卷 11-20页

作者： Tao-Zhi Yang Ali Esamdin Jian-Ning Fu hu-biao niu Guo-Jie Feng Fang-Fang Song Jin-Zhong Liu Lu Ma Xinjiang Astronomical Observatory Chinese Academy of Sciences Urumqi 830011 China University of Chinese Academy of Sciences Beijing 100049 China Department of Astronomy Beijing Normal University Beijing 100875 China

We present a study on pulsations of the high-amplitudeδScuti star YZ Boo based on photometric observations in Johnson V and R bands with both the Nanshan 1-m telescope of Xinjiang Astronomical Observatory（XAO）and the Xinglong 85-cm telescope of National Astronomical Observatories,Chinese Academy of Sciences（NAOC）.Fourier analysis of the light curves reveals the fundamental radial mode and its five harmonics,with the fourth and fifth being newly *** new times of maximum light are determined from the light curves,and combined with those in the literature,we construct the O-C diagram,derive a new ephemeris and determine a new value for the updated period of 0.104091579（2）.In addition,the O-C diagram reveals an increasing rate of period change for YZ *** models are calculated and constrained with the observationally determined parameters of YZ *** mass and age of YZ Boo are hence derived as M=1.61±0.05 M_⊙ and age=（1.44±0.14）×10~9 yr,*** both the frequency of the fundamental radial mode and the rate of period change,YZ Boo is located at the post main sequence stage.

关键词： stars:variables:δ Scuti star stars:individual(YZ Boo) stars:oscillations

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The wide-field photometric system of the Nanshan One-meter Telescope

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Research in Astronomy and Astrophysics 2020年第12期20卷 373-382页

作者： Chun-Hai Bai Guo-Jie Feng Xuan Zhang hu-biao niu Abdusamatjan Eskandar Guang-Xin Pu Shu-Guo Ma Jin-Zhong Liu Xiao-Jun Jiang Lu Ma Ali Esamdin Na Wang Xinjiang Astronomical Observatories Chinese Academy of SciencesUrumqi 830011China Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China

The Nanshan One-meter Wide-field Telescope is a prime focus system that is located at Nanshan Station of Xinjiang Astronomical *** field of view was designed to 1.5°× 1.5°,and the Johnson-Cousins UBVRI system was chosen as the main filter *** telescope has been providing observation services for astronomers since September *** source searching and time-domain surveys are the main scientific *** system’s test results are reported including linearity,dark current,bias,readout noise and gain of the CCD *** accurate instrumental calibration coefficients in UBVRI bands were driven with Landolt standard stars during photometric ***,the limiting magnitudes are given with signal-to-noise ratios and various exposure times for observers.

关键词： telescope filter CCD photometry

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KIC 10417986:Spectroscopic Confirmation of the Nature of the Binary System with aδScuti Component

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Research in Astronomy and Astrophysics 2022年第10期22卷 49-60页

作者： Guo-Jie Feng Ali Esamdin Jian-Ning Fu hu-biao niu Peng Zong Tao-Zhi Yang Shu-Guo Ma Jing Xu Chun-Hai Bai Yong Wang Wei-Chao Sun Xin-Liang Wang Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumgiXinjang 830011China University of Chinese Academy of Sciences Beijing 100049China Department of Astronomy Beijing Normal UniversityBeijing 100875China Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi'an Jiaotong University710049 Xi'anChina

KIC 10417986 is a short orbital period(0.0737 day)ellipsoidal variable star with aδSct andγDor hybrid pulsation component discovered by *** ground-based spectroscopic observations were carried out in the winters of 2020 and 2021 to investigate the binary nature of this *** derive the orbital parameters using the rvfit code with a result of K_(1)=29.7±1.5 km s^(-1),γ=-18.7±1.7 km s^(-1),and confirm an orbital period of 0.84495 day instead of the result given by *** atmospheric parameters of the primary are determined by the synthetic spectral fitting technique with the estimated values of T_(eff)=7411±187 K,log g=4.2±0.3 dex,[M/H]=0.08±0.09 dex and vsini=52±11 km s^(-1).KIC 10417986 is a circular orbit binary *** the single-lined nature and mass function of the star,the derived orbital inclination is 26°±6°,and the mass of the secondary is 0.52_(-0.09)^(+0.18)M_(⊙),which should be a late-K to early-M type *** frequencies are extracted from Kepler light curves,of which six independent frequencies in the high-frequency region are identified as the p-mode pulsations ofδSct star,and one independent frequency in the low-frequency region(f_(2)=1.3033 cd^(-1))is probably the rotational frequency due to the starspots rather than the ellipsoidal effect.

关键词： techniques spectroscopic-(stars:)binaries spectroscopic-stars individual(KIC 10417986)-stars oscillations(including pulsations)-stars variables delta Scuti-(stars:)starspots

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Investigating variable stars in the open cluster NGC 1912 and its surrounding field

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Research in Astronomy and Astrophysics 2021年第3期21卷 167-183页

作者： Chun-Yan Li Ali Esamdin Yu Zhang Fang-Fang Song Xiang-Yun Zeng Li Chen hu-biao niu Jian-Ying Bai Jun-hui Liu Xinjiang Astronomical Observatory the Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049BeijingChina Shanghai Astronomical Observatory the Chinese Academy of SciencesShanghai 200030China Department of Astronomy Beijing Normal UniversityBeijing 100875China

In this work,we studied the variable stars in the open cluster NGC 1912 based on the photometric observations and Gaia DR2 *** than 3600 CCD frames in B,V,R filters were reduced,and we obtained the light curves that span about 63 *** analyzing these light curves,we detected 24 variable stars,including 16 periodic variable stars,seven eclipsing binaries and one star whose type is *** these 24 variable stars,11 are newly discovered,which are classified as sixγDoradus stars,oneδScuti star,three detached binaries and one contact *** also confirmed 13 previously known variable *** on cluster members identified by Cantat-Gaudin et al.(2018),we inferred cluster memberships for these detected variable *** Gaia DR2 data,we plotted a new color-magnitude diagram for NGC1912,and showed the nature of variable cluster members in kinematical properties and heliocentric *** the 24 variable stars,seven variables are probable cluster members,which show homogeneity in kinematic characters and space position with the established cluster *** of the seven variable cluster members are the previously discovered stars,consisting of twoγDor stars and twoδSct *** remaining three variable cluster members,which are allγDor stars,are firstly detected in this *** main physical parameters of these variable cluster members estimated from the color-magnitude diagram are log(age/yr)=8.75,[Fe/H]=-0.1,m-M=10.03 mag,and E(B-V)=0.307.

关键词： open clusters and associations:NGC 1912 techniques:photometric stars:variables:general

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Dynamically self-adjustable liquid-liquid and self-adaptive softcontact solid-solid triboelectric nanogenerator for wave energy harvesting

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Nano Research 2025年第1期18卷 404-414页

作者： Yong Long Bingqi Zhao Jianan niu Yuxiu Liu Wei Sha Jiangwen Wang Zhong Lin Wang Weiguo hu Guangzhou Institute of Blue Energy Knowledge CityHuangpu DistrictGuangzhou 510555China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China

Water wave energy exhibits great potential toalleviate the global energy crisis. However, harvesting andutilizing wave energy are challenging due to its irregularity,randomness, and low frequency. Triboelectric nanogenerators(TENGs) have gained significant attention for harvesting waveenergy with high efficiency. This study presents a novelellipsoidal, pendulum-like TENG integrating both liquid-liquid(L-L) and solid-solid (S-S) triboelectricity (LS-TENG). Thisinnovative design enables continuous wave energy harvestingand self-powered marine environment monitoring under variousconditions, including temperature, humidity, and light intensity. The binary immiscible liquids within the LS-TENG’s innersoft balloon create dynamic, and self-adjustable L-L contact interfaces, significantly increasing the L-L contact area andenhancing L-L contact electrification (CE). The unique self-adaptive, soft S-S contact increases the S-S contact areacompared to traditional hard point contact, better adapting to the irregular movements of waves and promoting efficient S-SCE. The LS-TENG achieves highly efficient wave energy harvesting by coupling L-L and S-S CE. Furthermore, the uniquesoft contact design protects the S-S interfaces from mechanical wear and damage during long-term work. The LS-TENG’snovel structure provides an innovative and effective way for water wave energy harvesting.

关键词： self-adaptive soft-contact solid-solid liquid-liquid self-adjustable triboelectric nanogenerator

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A Flexible Smart Healthcare Platform Conjugated with Artificial Epidermis Assembled by Three‑Dimensionally Conductive MOF Network for Gas and Pressure Sensing

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Nano-Micro Letters 2025年第2期17卷 601-620页

作者： Qingqing Zhou Qihang Ding Zixun Geng Chencheng hu Long Yang Zitong Kan biao Dong Miae Won Hongwei Song Lin Xu Jong Seung Kim State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China Department of Chemistry Korea UniversitySeoul 02841Republic of Korea TheranoChem Incorporation Seoul 02856Republic of Korea

The rising flexible and intelligent electronics greatly facilitate the noninvasive and timely tracking of physiological information in telemedicine *** building bionic-sensitive moieties is vital for designing efficient electronic skin with advanced cognitive functionalities to pluralistically capture external ***,realistic mimesis,both in the skin’s three-dimensional interlocked hierarchical structures and synchronous encoding multistimuli information capacities,remains a challenging yet vital need for simplifying the design of flexible logic ***,we construct an artificial epidermal device by in situ growing Cu_(3)(HHTP)_(2) particles onto the hollow spherical Ti_(3)C_(2)T_(x) surface,aiming to concurrently emulate the spinous and granular layers of the skin’s *** bionic Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2) exhibits independent NO_(2) and pressure response,as well as novel functionalities such as acoustic signature perception and Morse code-encrypted message ***,a wearable alarming system with a mobile application terminal is self-developed by integrating the bimodular senor into flexible printed *** system can assess risk factors related with asthmatic,such as stimulation of external NO_(2) gas,abnormal expiratory behavior and exertion degrees of fingers,achieving a recognition accuracy of 97.6%as assisted by a machine learning *** work provides a feasible routine to develop intelligent multifunctional healthcare equipment for burgeoning transformative telemedicine diagnosis.

关键词： Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2)composites NO_(2)/pressure flexible sensors Health-monitoring Machine learning

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Infrared radiation characteristics of a hypersonic vehicle under time-varying angles of attack

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Chinese Journal of Aeronautics 2019年第4期32卷 861-874页

作者： Qinglin niu Zhichao YUAN biao CHEN Shikui DONG School of Energy Science and Engineering Harbin Institute of Technology Key Laboratory of Aerospace Thermophysics of Ministry of Industry and Information Technology Harbin Institute of Technology Key Laboratory of Chemical Laser Dalian Institute of Chemical Physics Chinese Academy of Sciences

Hypersonic vehicles emit strong infrared(IR) radiation signatures that can be treated as a detecting source for object identification and routine diagnosis. This paper is aimed at examining the intrinsic radiation characteristics of a Boost-Glide Vehicle(BGV) under the condition of various Angles of Attack(AOAs). A two-temperature model considering the thermal and chemical nonequilibrium effects is coupled with Navier-Stokes equations solved by the finite volume technique.A gas–solid conjunction heat transfer model is also added into the fluid solver to simulate the surface temperature of the vehicle. The radiative transfer equation is solved with Line of Sight(LOS)algorithm. The computational results for a Hypersonic Technology Vehicle-2(HTV-2) type vehicle show that radiances of the vehicle are strongly dependent on the surface temperature. The presence of AOA results in the significant difference of the surface temperature. Infrared radiation characteristics are also changed in intensity and spectral band due to the AOA. Simulations are performed with two time-varying AOAs. Transient results indicate that the variation of AOA does have a great effect on the infrared radiance and is closely related to observation angle, spectral band, angle size,angular velocity and time history.

关键词： Angle of attack Fluid-thermal interaction HTV-2 Hypersonic vehicle IR radiation Surface temperature

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