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Expected Evolution of the Binary System ATLAS J1138-5139 认领 引用
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作者 Jing-Qi Chen Hai-Liang Chen +2 位作者 Zheng-Wei Liu Xuefei Chen Zhanwen Han 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第5期156-162,共7页
ATLAS J1138-5139 is a newly detected ultra-compact double white dwarf(DWD) system which is composed of a 1.02 M⊙ carbon-oxygen white dwarf(CO WD) and a 0.24M⊙ helium(He) WD with an orbital period of about 27.68 minu... ATLAS J1138-5139 is a newly detected ultra-compact double white dwarf(DWD) system which is composed of a 1.02 M⊙ carbon-oxygen white dwarf(CO WD) and a 0.24M⊙ helium(He) WD with an orbital period of about 27.68 minutes,making it one of the shortest-period DWD systems known.The future evolution and final fate of this system remain unexplored.In this work,we investigate the evolution of ATLAS J1138-5139 with the onedimensional stellar evolution code Modules for Experiments in Stellar Astrophysics.We find that ATLAS J1138-5139 will evolve into an AM Canum Venaticorum system in about~6.3 Myr.Afterwards,the transferred material from the He WD companion start to build up to form a He shell near the surface of the CO WD.This accumulated He-shell masses can be up to approximately 0.12M⊙,which is likely to trigger a double-detonation(DDet) explosion of the CO WD.We therefore expect that ATLAS J1138-5139 will likely explode as a type Ⅰa supernova eventually through the DDet explosion mechanism.Moreover,our calculations show that ATLAS J1138-5139 will be a promising target for gravitational-wave detection by future detectors like LISA,TianQin and Taiji. 展开更多
关键词 methods numerical-(stars:)binaries(including multiple) close-stars evolution-(stars:)supernovae general-(stars:)white dwarfs
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LGRBs Born in Ultra-compact Binary System: Companion's Long-term Tidal Force and Periodicity in GRB Afterglows 认领 引用
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作者 Tian-Ci Zheng Xiang-Dong Li +1 位作者 Da-Ming Wei Zhi-Ping Jin 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2025年第6期1-6,共6页
Most massive stars reside in binary or multi-object systems.Short gamma-ray bursts(sGRBs),the product of the merger of double compact objects,may originate from massive common-envelope binaries.In contrast,the progeni... Most massive stars reside in binary or multi-object systems.Short gamma-ray bursts(sGRBs),the product of the merger of double compact objects,may originate from massive common-envelope binaries.In contrast,the progenitors of long GRBs(lGRBs)are typically considered isolated massive stars.However,no effective method has yet been established to identify potential companions from current observations.Recent studies have demonstrated that quasi-periodic oscillation signatures can serve as a promising tool to probe the properties of GRB central engines.In this study,by drawing an analogy to periodicity in X-ray binaries,we explore the precession periods of companion-induced disk precession for lGRBs born in the ultra-compact binary scenario.Our results suggest that the periodicity observed in lGRB afterglows,measured in units of 1000 s or more,may indicate that lGRBs originate within binary systems.GRB 050904 could represent a rare case where the burst occurred in a binary system,leaving behind a black hole–black hole binary at redshift z=6.29. 展开更多
关键词 (stars:)gamma-ray burst general-(stars:)binaries(including multiple) close-accretion,accretion disks
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Spectroscopic Study of the Late B-type Eclipsing Binary System AR Aurigae A and B:Towards Clarifying the Differences in Atmospheric Parameters and Chemical Abundances 认领 引用
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作者 Yoichi Takeda 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2025年第2期160-172,共13页
AR Aur A+B is a close binary of astrophysical interest because dissimilar surface compositions are reported between similar late B-type dwarfs.A new spectroscopic study on this system was carried out based on the dise... AR Aur A+B is a close binary of astrophysical interest because dissimilar surface compositions are reported between similar late B-type dwarfs.A new spectroscopic study on this system was carried out based on the disentangled spectra,in order to determine their atmospheric parameters and elemental abundances.The effective temperature and microturbulence(determined from the equivalent widths of Fe II lines)turned out to be(11,150 K,0.9 km s-1)and(10,650 K,0.1 km s-1)for A and B,respectively.The chemical abundances of 28 elements were then derived while taking into account the non-LTE effect for Z≤15 elements(Z:atomic number).The following trends were elucidated for[X/H](abundance of X relative to the Sun):(1)Qualitatively,[X/H]shows a rough global tendency to increase with Z,with the gradient steeper for A than for B.(2)However,considerable dispersion is involved for A,since prominently large peculiarities are seen in specific elements reflecting the characteristics of HgMn stars(e.g.,very deficient N,Al,Sc,Ni;markedly overabundant P,Mn).(3)In contrast,the Z-dependence of[X/H]for B tends to be nearly linear with only a small dispersion.These observational facts may serve as a key to understanding the critical condition for the emergence of the chemical anomaly. 展开更多
关键词 stars:abundances stars:atmospheres (stars:)binaries:spectroscopic stars:chemically peculiar stars:early-type stars:individual(AR Aur)
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Analysis of a Double-lined Spectroscopic Binary System Using LAMOST and TESS Data 认领 引用
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作者 Daoye Yang Jianrong Shi +4 位作者 Ali Esamdin Chunqian Li Xiang-Lei Chen Rivkat Karimov Shuhrat A.Ehgamberdiev 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2025年第9期123-131,共9页
We present a detailed analysis of a double-lined spectroscopic binary system,Bo Gem,using data obtained from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST)and the Transiting Exoplanet Survey Sat... We present a detailed analysis of a double-lined spectroscopic binary system,Bo Gem,using data obtained from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST)and the Transiting Exoplanet Survey Satellite(TESS).By applying spectral disentangling techniques to the LAMOST Medium Resolution Spectra,we determine the orbital parameters,including the orbital period of P=4.0689 days,and semimajor axis of a=14.90±0.04 R⊙.The mass ratio between the two components is found to be q=0.198±0.006,with an inclination of i=82°.3±0°.13.The photometric data from TESS revealed periodic light variations due to the eclipsing nature of the system,allowing for the determination of the primary star’s radius as R1=1.68±0.03 R⊙and the secondary star’s radius as R2=3.68±0.04 R⊙.The effective temperatures of the primary and secondary stars are measured to be Teff,1=9705±50 K and Teff,2=5830±22 K,respectively.By analyzing the disentangled spectra,we determined the stellar atmospheric parameters—including surface gravity and metallicity of both stars.These results not only confirm the double-lined spectroscopic binary status of Bo Gem,but also underscore its value as an important system for testing and refining stellar evolution models. 展开更多
关键词 (stars:)binaries eclipsing-(stars:)binaries spectroscopic-(stars:)binaries general
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Revised Orbital,Physical,Stability,and Habitability Parameters of the Binary System HD 25811 Using Gaia Observations 认领 引用
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作者 Hassan B.Haboubi Mashhoor A.Al-Wardat +5 位作者 Ahmad A.Abushattal Maximiliano Dirk Hatem Widyan Naufa Nazar Joshua V.Thomji Suhail Masda 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2025年第12期147-156,共10页
Al-Wardat's method is used in this research to analyze the two components of the HD 25811 binary system,which combines the results of speckle interferometry with the astrometric data to construct the synthetic spe... Al-Wardat's method is used in this research to analyze the two components of the HD 25811 binary system,which combines the results of speckle interferometry with the astrometric data to construct the synthetic spectral energy distribution of the system.The method results in the effective temperatures at 7100±50 K for component A and 7000±50 K for component B,while their masses measure as 1.65±0.15M⊙for component A and1.58±0.14M⊙for component B.The system exists at an estimated age of 0.794 Gyr,while both stars remain in their initial subgiant evolutionary phase.The evolutionary tracks together with isochrones for Z=0.03 validate that the system components share both their origin and chemical compositions.The orbital analysis shows that the system has a period of 15.97 yr and an eccentricity of 0.713,while the total system mass amounts to3.65±0.49 M⊙.We detailedly analyze the system's orbital dynamics to assess planetary stability and habitability zones,which lead to the dynamics of circumbinary(P-type)and circumstellar(S-type)orbits using empirical criteria,revealing large regions in which planetary orbits remain dynamically stable.Luminosities and effective temperatures of each stellar component are used to determine their habitable zones. 展开更多
关键词 (stars:)binaries(including multiple):close (stars:)binaries:visual (stars:)binaries:spectroscopic stars:evolution Astrometry and Celestial Mechanics
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Four Total Eclipsing Contact Binary Systems:The First Photometric Light Curve Solutions Employing TESS and Gaia Surveys 认领 引用
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作者 Atila Poro Razieh Aliakbari +2 位作者 Hossein Azarara Asma Ababafi Sadegh Nasirian 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2025年第3期131-140,共10页
We presented the first photometric light curve solutions of four W Ursae Majoris-type contact binary systems.This investigation utilized photometric data from the Transiting Exoplanet Survey Satellite and Gaia Data Re... We presented the first photometric light curve solutions of four W Ursae Majoris-type contact binary systems.This investigation utilized photometric data from the Transiting Exoplanet Survey Satellite and Gaia Data Release 3(DR3).We used the PHysics Of Eclipsing BinariEs Python code and the Markov Chain Monte Carlo method for these light curve solutions.Only TIC 249064185 among the target systems needed a cold starspot to be included in the analysis.Based on the estimated mass ratios for these total eclipse systems,three of them are categorized as low mass ratio contact binary stars.The absolute parameters of the systems were estimated using the Gaia DR3 parallax method and the orbital period and semimajor axis(P-a)empirical relationship.We ascertained that the TIC 318015356 and TIC 55522736 systems are A-subtypes,while TIC 249064185 and TIC 397984843 are W-subtypes,depending on each component’s effective temperature and mass.We estimated the initial masses of the stars,the mass lost by the binary system,and the systems’ages.We displayed star positions in the mass-radius,mass-luminosity,and total mass-orbital angular momentum diagrams.In addition,our findings indicate a good agreement with the mass-temperature empirical parameter relationship for the primary stars. 展开更多
关键词 (stars )binaries(including multiple) close-stars fundamental parameters-methods data analysis
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Thermodynamic assessment of Mg-Ga binary system 认领 引用 被引量：2
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作者 孟凡桂 王江 +2 位作者 戎茂华 刘立斌 金展鹏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2010年第3期450-457,共8页
In order to obtain the thermodynamic description of the Mg-Ga binary system,the thermodynamic assessment of the system was carried out using the CALPHAD method through Thermo-calc software package based on the evalu... In order to obtain the thermodynamic description of the Mg-Ga binary system,the thermodynamic assessment of the system was carried out using the CALPHAD method through Thermo-calc software package based on the evaluation of all available experimental data from the published literature.The solution phases,including liquid,hcp(Mg) and orthorhombic(Ga),were described by the substitutional solution model,of which the excess Gibbs energies were expressed with the Redlich-Kister polynomial.Meanwhile,all intermetallic compounds,Mg5Ga2,Mg2Ga,MgGa,MgGa2 and Mg2Ga5,were modeled as stoichiometric compounds.A set of self-consistent thermodynamic parameters formulating the Gibbs energies of various phases in the Mg-Ga binary system were obtained finally.The much better agreement is achieved between the calculated results and the reported experimental data. 展开更多
关键词 Mg-based alloys phase diagram thermodynamic CALPHAD method Mg-Ga binary system
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Thermodynamic assessment of the Bi-Mg binary system 认领 引用 被引量：2
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作者 Chunju NIU Changrong LI +2 位作者 Zhenmin DU Cuiping GUO Yongjuan JING 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2012年第1期19-28,共10页
The Bi-Mg binary system had been assessed by adopting the ionic melt and the modified quasi-chemical models to describe the liquid phase with short range ordering behavior.In general considerations of the development ... The Bi-Mg binary system had been assessed by adopting the ionic melt and the modified quasi-chemical models to describe the liquid phase with short range ordering behavior.In general considerations of the development of the thermodynamic database of the multi-component Mg-based alloys and the consistency of the thermodynamic models of the related phases,the Gibbs energy descriptions of all the phases in the Bi-Mg binary system were reasonably re-modeled and critically re-assessed in the present work.Especially for the liquid phase,the associate model was used with the constituent species Bi,Mg and Bi2Mg3.The Mg-rich terminal phase hcp_A3 was modeled as a substitutional solution following Redlich-Kister equation and the Bi-rich terminal phase Rhombohedral_A7 was treated as a pure Bi substance since the extremely small solubility of Mg in Bi.The low and high temperature non-stoichiometric compoundsβ-Bi2Mg3 andα-Bi2Mg3 were described by the sublattice models(Bi,Va)2Mg3 and(Bi)1(Bi,Va)3Mg6 respectively based on their structure features.A set of self-consistent thermodynamic parameters of the Bi-Mg system was obtained and the experimental thermodynamic and phase equilibrium data were well reproduced by the optimized thermodynamic data. 展开更多
关键词 Bi-Mg binary system Thermodynamic assessment Gibbs energy expression Associate model
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Vapor-Liquid Equilibria for Dimethyl Carbonate-n-Butyl Acetate Binary System at 101.325kPa 认领 引用 被引量：3
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作者 施云海 李文清 涂晋林 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 1999年第1期83-85,共3页
The vapor-liquid equilibrium (VLE) data for the dimethyl carbonate-n-butyl acetate binary system were measured by an Ellis equilibrated distillator. The experimental data were checked for their thermodynamic consisten... The vapor-liquid equilibrium (VLE) data for the dimethyl carbonate-n-butyl acetate binary system were measured by an Ellis equilibrated distillator. The experimental data were checked for their thermodynamic consistency through statistical methods. The VLE data was correlated with Wilson and NRTL activity coefficient models and also with the calculation of the vapor phase fugacity coefficient by the modified Peng-Robinson equation of state. 展开更多
关键词 vapor-liquid equilibrium binary system dimethyl carbonate n-butyl acetate
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Study on Phase Equilibrium Properties for CO2^+ Cosolvent Binary Systems 认领 引用 被引量：3
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作者 Zhang Jing CHANG Wu Xiang YANG Cao Wei LIANG 《Chinese Chemical Letters》 SCIE CAS 2001年第9期829-832,共4页
In this study, the constant volume, visual method is used to measure the critical point of CO2+toluene, CO2+cyclohexane, CO2+n-butyraldehyde, CO2+i-butyraldehyde, CO2+methanol and CO2+alcohol binary systems. The relat... In this study, the constant volume, visual method is used to measure the critical point of CO2+toluene, CO2+cyclohexane, CO2+n-butyraldehyde, CO2+i-butyraldehyde, CO2+methanol and CO2+alcohol binary systems. The relationship between critical point and the concentration of the entrainer for different substances has been discussed, and the comparison of the phase behavior of single component system and that of binary systems have been carried out. 展开更多
关键词 Critical point supercritical binary system phase equilibrium
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Thermodynamic optimization of Bi-Ni binary system 认领 引用 被引量：1
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作者 王江 孟凡桂 +1 位作者 刘立斌 金展鹏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第1期139-145,共7页
Based on the available experimental data,the Bi-Ni binary system was optimized thermodynamically by the CALPHAD method.The solution phases,including liquid,fcc_A1（Ni） and rhombohedral_A7（Bi）,were described as subs... Based on the available experimental data,the Bi-Ni binary system was optimized thermodynamically by the CALPHAD method.The solution phases,including liquid,fcc_A1（Ni） and rhombohedral_A7（Bi）,were described as substitutional solution phases,of which the excess Gibbs energies were expressed with the Redlich-Kister polynomial.The intermetallic compound,BiNi,was modeled using three sublattices（Bi）（Ni,Va）（Ni,Va） considering its crystal structure（NiAs-type） and the compatibility of thermodynamic database in the multi-component systems,while Bi3Ni was treated as a stoichiometric compound.Finally,a set of self-consistent thermodynamic parameters formulating the Gibbs energies of various phases in this binary system were obtained.The calculated results are in reasonable agreement with the reported experimental data. 展开更多
关键词 Sn-based alloy phase diagram thermodynamics CALPHAD Bi-Ni binary system
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Study on the NaCl-CaCl_2 Binary System 认领 引用 被引量：1
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作者 Qiao Zhiyu Du Ailing +4 位作者 Mo Wenjing Zhi Jinbiao Wang Mingsheng Zheng Chaogui Duan Shuzhen Dept.of Physical Chemistry,University of Science and Technology Beijing Former Beijing University of Iron and Steel Technology Dept.of Chemistry,Peking University. 《Rare Metals》 SCIE EI CAS 1989年第1期9-13,共5页
By use of micro-DTA technique as well as ambient and high temperature X-ray analysis the phase diagram of NaCl-CaCl_2 has been checked.It is.a simple eutectic system with a solid solubility in the sodium chloride side... By use of micro-DTA technique as well as ambient and high temperature X-ray analysis the phase diagram of NaCl-CaCl_2 has been checked.It is.a simple eutectic system with a solid solubility in the sodium chloride side.The eutectic point is at 773K,49 mol% NaCl.The experimental results,especially those of the X-ray diffraction studies have showed that the incongruent compound 4NaCl-CaCl_2 does not exist in the NaCl-CaCl_2 system. 展开更多
关键词 Study on the NaCl-CaCl2 Binary System NaCl
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Dendritic sidebranches of a binary system with enforced flow 认领 引用 被引量：1
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作者 李向明 王自东 《Chinese Physics B》 SCIE EI CAS 2010年第12期394-399,共6页
In the present paper, the problem of sidebranches in the binary dendritic growth with enforced flow is studied. The positions of the first sidebranch and spacing of dendritic sidebranches are presented. For the neutra... In the present paper, the problem of sidebranches in the binary dendritic growth with enforced flow is studied. The positions of the first sidebranch and spacing of dendritic sidebranches are presented. For the neutral stable mode of dendritic growth, effects of various parameters on sidebranches are analysed. Our result shows that sidebranches are produced behind a critical point ξC′. 展开更多
关键词 binary system sidebranches enforced flow pattern formation
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A Prediction of the Excess Partial Molar Free Energies of MgCl_2 in the KCI-MgCl_2-LiCl Molten Salt System Containing MgCl_2 below 0.5 from Thermodynamic Properties of Binary Systems 认领 引用 被引量：2
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作者 Quanru ZHANG, Yuangao LI and Zheng FANG 《Journal of Materials Science & Technology》 SCIE EI CAS 2000年第1期85-87,共3页
The thermodynamical properties of MgCl_2 in KCI-MgCl_2-LiCl molten electrolytes containing MgCl_2 below 0.5 (mole fraction, the same below) have been determined from the interchange energies of two binary systems KCI-... The thermodynamical properties of MgCl_2 in KCI-MgCl_2-LiCl molten electrolytes containing MgCl_2 below 0.5 (mole fraction, the same below) have been determined from the interchange energies of two binary systems KCI-MgCl_2 and LiCI-MgCl_2, by means of a model on the assumptions that the electrolytes in the solution are treated as independent particles instead of their ion forms and the interchange energy between the component pair KCI-LiCl is ignored when compared with those of component pairs KCl-MgCl_2 and MgCl_2-LiCl. The interchange energies, wKCl-MgCl_2 and wMgcCl_2-Licl, are obtained as-70000 and -13800 J.mol-1, from the corresponding binary solutions, respectively. 展开更多
关键词 KCI Free A Prediction of the Excess Partial Molar Free Energies of MgCl2 in the KCI-MgCl2-LiCl Molten Salt System Containing MgCl2 below 0.5 from Thermodynamic Properties of Binary Systems LiCl
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Calculation of Gas-Liquid Critical Curves for Binary Systems Containing Methane 认领 引用
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作者 朱荣娇 李洪玲 +2 位作者 郝纪双 李贺松 田宜灵 《Transactions of Tianjin University》 EI CAS 2009年第4期276-282,共7页
The critical curves for binary systems of methane combined with nitrogen, carbon monoxide, carbon dioxide, ethane, propane, butane and water at temperatures from 125 K to 650 K and pressures from 3.5 MPa to 250 MPa we... The critical curves for binary systems of methane combined with nitrogen, carbon monoxide, carbon dioxide, ethane, propane, butane and water at temperatures from 125 K to 650 K and pressures from 3.5 MPa to 250 MPa were calculated by using Heilig-Franck equation of state. This equation of state contains a repulsion term and an attraction term for intermolecular interaction. With pairwise combination rules for these potentials, three adjustable parameters are needed. The results showed that the critical curves of the former six binary systems belonged to type I, and CH4＋H2O system belonged to type III. The calculated data were compared with the experimental data,which yielded good results for the pressure-temperature, pressure-composition and temperature-composition behaviors of the seven systems. Moreover, the values of the adjustable parameters were obtained from the calculation of the critical curves. They can also be used for other relevant calculation. 展开更多
关键词 critical curves binary systems methane calculation
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ASSESSMENT AND OPTIMIZATION OF THE PHASE DIAGRAMS AND THERMODYNAMIC DATA OF SOME BINARY SYSTEMS CONTAINING PRASEODYMIUM CHLORIDES 认领 引用
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作者 乔芝郁 王明生 +1 位作者 郑朝贵 段淑贞 《Journal of Rare Earths》 SCIE EI CAS 1990年第2期92-98,共7页
In this paper a critical assessment and optimization of the phase diagrams and thermodynamic properties of the PrCl_3-MCl(M=Li,Na)and PrCl_3-MCl_2(M=Mg,Ca,Sr,Ba) binary systems have been per- formed.The assessed and o... In this paper a critical assessment and optimization of the phase diagrams and thermodynamic properties of the PrCl_3-MCl(M=Li,Na)and PrCl_3-MCl_2(M=Mg,Ca,Sr,Ba) binary systems have been per- formed.The assessed and optimized binary phase diagrams and thermodynamic data with self consistency are a better basis for constructing multicomponent phase diagrams. 展开更多
关键词 ASSESSMENT AND OPTIMIZATION OF THE PHASE DIAGRAMS AND THERMODYNAMIC DATA OF SOME BINARY SYSTEMS CONTAINING PRASEODYMIUM CHLORIDES
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Motion of the moonlet in the binary system 243 Ida 认领 引用 被引量：1
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作者 L.Lan Y.Ni +1 位作者 Y.Jiang J.Li 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2018年第1期214-224,共11页
The motion of the moonlet Dactyl in the binary system 243 Ida is investigated in this paper. First, periodic orbits in the vicinity of the primary are calculated, including the orbits around the equilibrium points and... The motion of the moonlet Dactyl in the binary system 243 Ida is investigated in this paper. First, periodic orbits in the vicinity of the primary are calculated, including the orbits around the equilibrium points and large-scale orbits. The Floquet multipliers’ topological cases of periodic orbits are calculated to study the orbits’ stabilities. During the continuation of the retrograde near-circular orbits near the equatorial plane, two period-doubling bifurcations and one Neimark–Sacker bifurcation occur one by one, leading to two stable regions and two unstable regions. Bifurcations occur at the boundaries of these regions. Periodic orbits in the stable regions are all stable, but in the unstable regions are all unstable. Moreover, many quasi-periodic orbits exist near the equatorial plane. Long-term integration indicates that a particle in a quasi-periodic orbit runs in a space like a tire. Quasi-periodic orbits in different regions have different styles of motion indicated by the Poincare sections. There is the possibility that moonlet Dactyl is in a quasi-periodic orbit near the stable region I, which is enlightening for the stability of the binary system. 展开更多
关键词 Binary system Bifurcation Periodic orbits Quasi-periodic orbits
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1SWASP J034439.97+030425.5:a short-period eclipsing binary system with a close-in stellar companion 认领 引用 被引量：4
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作者 Bin Zhang Sheng-Bang Qian +5 位作者 Jing-Jing Wang Qi-Jun Zhi Ai-Jun Dong Wei Xie Li-Ying Zhu Lin-Qiao Jiang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2020年第4期31-38,共8页
First multi-wavelength photometric light curves(LCs)of the short-period eclipsing binary(EB)1 SWASP J034439.97+030425.5(hereafter J0344)are presented and analyzed by using the 2013 version of the Wilson-Devinney(W-D)c... First multi-wavelength photometric light curves(LCs)of the short-period eclipsing binary(EB)1 SWASP J034439.97+030425.5(hereafter J0344)are presented and analyzed by using the 2013 version of the Wilson-Devinney(W-D)code.To explain the asymmetric LCs of J0344,a cool star-spot on the less massive component was employed.The photometric solutions suggest that J0344 is a W-subtype shallow contact EB with a contact degree of f=4.9%±3.0%and a mass ratio of q=2.456±0.013.Moreover,an obvious third light was detected in our analysis.We calculated the average luminosity contribution of the third light to the total light,and that value reaches up to 49.78%.Based on the O-C method,the variations of the orbital period were studied for the first time.Our O-C diagram reveals a secular decrease superimposed on a cyclic oscillation.The orbital period decreases at a rate of d P/dt=-6.07×10-7 d yr-1,which can be explained by the mass transfer from the more massive component to the less massive one.Besides,its O-C diagram also shows a cyclic oscillation with an amplitude of 0.0030 d and a period about 7.08 yr,which can be explained by the presence of a third body with a minimum mass of M3 min=0.15±0.02 M⊙.The third component may play an important role in the formation and evolution of J0344 by drawing angular momentum from the central system. 展开更多
关键词 stars:binaries:close stars:binaries:eclipsing stars:individual(1SWASP J034439.97+030425.5)
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Thermodynamic modeling of the Ge-La binary system 认领 引用
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作者 Miao Liu Chang-rong Li +2 位作者 Zhen-min Du Cui-ping Guo Chun-ju Niu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第8期689-698,共10页
The Ge-La binary system was critically assessed by means of the calculation of phase diagram （CALPHAD） technique. The asso- ciate model was used for the liquid phase containing the constituent species Ge, La, Ge3La5... The Ge-La binary system was critically assessed by means of the calculation of phase diagram （CALPHAD） technique. The asso- ciate model was used for the liquid phase containing the constituent species Ge, La, Ge3La5, and Ge1.7La. The terminal solid solution diamond-（Ge） with a small solubility of La was described using the substitutional model, in which the excess Gibbs energy was formulated with the Redlich-Kister equation. The compounds with homogeneity ranges, μ（Gel.7La）, β（Ge1.7La）, and （GeLa）, were modeled using two sublatrices asα（Ge,La）l.7La, β（Ge,La）l.7La, and （Ge,La）（Ge,La）, respectively. The intermediate phases with no solubility ranges, Ge4Las, GeaLa4, Ge3Las, and GeLa3, were treated as stoichiometric compounds. The three allotropic modifications of La, dhcp-La, fcc-La, and bcc-La, were kept as pure element phases since no solubility of Ge in La was reported. A set of self-consistent thermodynamic parameters of the Ge-La binary system was obtained. The calculation results agree well with the available experimental data from literatures. 展开更多
关键词 hydrogen storage alloys binary systems germanium lanthanum thermodynamics modeling phase diagrams
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Orbital and physical parameters of the close binary system GJ 9830(HIP 116259) 认领 引用 被引量：2
20
作者 Suhail G.Masda Mashhoor A.Al-Wardat J.M.Pathan 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2019年第7期163-172,共10页
We present the complete set of physical and geometrical parameters of the visual close binary system GJ 9830 for the first time by applying Al-Wardat’s complex method.This method combines magnitude difference from sp... We present the complete set of physical and geometrical parameters of the visual close binary system GJ 9830 for the first time by applying Al-Wardat’s complex method.This method combines magnitude difference from speckle interferometry,synthetic spectral energy distributions of the binary components which are constructed based on grids of Kurucz blanketed models(ATLAS9),and the orbital solution using Tokovinin’s dynamical method to estimate the parameters of individual components.The analysis of the system by employing synthetic photometry resulted in the following set of parameters:Teff= 6220 ± 100 K,log g = 4.30 ± 0.12,R = 1.10 ± 0.08 R⊙for the primary component and Teff= 4870 ± 100 K,log g = 4.60 ± 0.11,R = 0.709 ± 0.07 R⊙for the secondary component.The recently published dynamical parallax from the Gaia space mission was used to calculate the total mass of the binary system as 1.75 ± 0.06 M⊙,which coincides with those estimated using Al-Wardat’s method as MA= 1.18 ± 0.10 M⊙,MB= 0.75 ± 0.08 M⊙.The analysis of the system reveals that both components are characteristic of main sequence stars and have an age of around 1.4 ± 0.50 Gyr.The evolutionary tracks and isochrones of the system’s components are discussed,and the fragmentation process is suggested as the most likely process for the formation of the system. 展开更多
关键词 binaries close-binaries visual-stars fundamental parameters-technique synthetic photometry-stars individual GJ 9830
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