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First Report of Late Miocene Mammals Including Chilotherium in the Xining Basin,NE Tibetan Plateau,China 认领 引用 被引量：2
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作者 HAN Jianen SHAO Zhaogang +6 位作者 XU Biao ZHANG Qianqian YU Jia MENG Qingwei MENG Xiangang ZHU Dagang WANG Jin 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第3期1135-1136,共2页
Objective Xining basin is located in the northeastern Qinghai- Tibetan Plateau, which tectonic location belongs to a junction of the Kunlun and Qilian mountains. The southern, northern and western parts of the basin a... Objective Xining basin is located in the northeastern Qinghai- Tibetan Plateau, which tectonic location belongs to a junction of the Kunlun and Qilian mountains. The southern, northern and western parts of the basin are restricted by the Laji, Daban and Riyue mountains fault zones, and go eastward into the Longzhong basin in Gansu Province. A succession of Cenozoic lacustrine sedimentary strata has been well developed in the Xining basin, with sediments over 800 m thick. 展开更多
关键词 of as In on in First Report of Late Miocene Mammals Including Chilotherium in the Xining Basin,NE Tibetan Plateau,China
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Theoretical Study on the Spectroscopic Parameters and Transition Properties of MgH Radical Including Spin-orbit Coupling 认领 引用 被引量：1
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作者 伍冬兰 谭彬 +4 位作者 曾学锋 万慧军 谢安东 闫冰 丁大军 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第6期12-16,共5页
An accurate theoretical study on the MgH radical is reported by adopting the high-level relativistic MRCI＋Q method with a quintuple-zeta quality basis set. The reliable potential energy curves of the five A-S states ... An accurate theoretical study on the MgH radical is reported by adopting the high-level relativistic MRCI＋Q method with a quintuple-zeta quality basis set. The reliable potential energy curves of the five A-S states of MgH are derived. Then the associated spectroscopic parameters are determined and found to be in good accordance with the available experimental results. The permanent dipole moments （PDMs） and the spin-orbit （SO） matrix elements of A-S states are computed. The results show that the abrupt changes of PDMs and SO matrix elements are attributed to the variations of electronic configurations at the avoided crossing point. The SOC effect leads to the five A-S states split into ten Ω states and results in the double potential well of （2）1//2 state. Finally, the transition properties from the （2）1//2, （1）3//2 and （3）1//2 states to the ground state X2∑＋1//2 transitions are obtained, including the transition dipole moments, Franck-Condon factors and radiative lifetimes. 展开更多
关键词 of on in Theoretical Study on the Spectroscopic Parameters and Transition Properties of MgH Radical Including Spin-orbit Coupling SOC been that MRCI
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Polymorphic multiple hepatocellular adenoma including a non-steatotic HNF1α-inactivated variant 认领 引用 被引量：1
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作者 Kayvan Mohkam Benjamin Darnis +5 位作者 Jean-Baptiste Cazauran Agnès Rode Anne-Frédérique Manichon Christian Ducerf Brigitte Bancel Jean-Yves Mabrut 《Hepatobiliary & Pancreatic Diseases International》 SCIE CAS CSCD 2017年第5期552-555,共4页
To the Editor:Hepatocellular adenomas(HCAs)consist of benign liver tumors favored by the use of oral contraceptives,which preferentially occur in women.[1,2]They expose to the risk of hemorrhage(20%of cases)and more r... To the Editor:Hepatocellular adenomas(HCAs)consist of benign liver tumors favored by the use of oral contraceptives,which preferentially occur in women.[1,2]They expose to the risk of hemorrhage(20%of cases)and more rarely,to the risk of malignant transformation(4%-10%of cases).[3,4]Multiple HCAs,which are defined by the presence of 10 or more 展开更多
关键词 HNF Polymorphic multiple hepatocellular adenoma including a non-steatotic HNF1 HCA
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A Precise Description of the Electronic Structures and Spin-Allowed Transition Properties of PF and Its Cation:All-Electron Configuration-Interaction Investigations Including Relativistic Effect 认领 引用 被引量：1
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作者 李奇楠 赵书涛 +3 位作者 张晓美 罗旺 李瑞 闫冰 《Chinese Physics Letters》 SCIE EI CAS CSCD 2015年第7期42-46,共5页
The electronic structures of PF and PF＋ are calculated with the high-level configuration interaction method. To improve the precision of calculations, the spin-orbit coupling effect, the scalar relativistic effect, a... The electronic structures of PF and PF＋ are calculated with the high-level configuration interaction method. To improve the precision of calculations, the spin-orbit coupling effect, the scalar relativistic effect, and the Davidson correction（q-Q） are also considered. The spectroscopic parameters of bound states are derived by the electronic structures of PF and PF＋, which are in good accordance with the measurements. The transition dipole moments of spin-allowed transitions are evaluated, and the radiative lifetimes of several A S states of PF and PF＋ are obtained. 展开更多
关键词 A Precise Description of the Electronic Structures and Spin-Allowed Transition Properties of PF and Its Cation:All-Electron Configuration-Interaction Investigations Including Relativistic Effect PF TDM
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Geometric Scaling Analysis of Deep Inelastic Scattering Data Including Heavy Quarks 认领 引用
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作者 吴庆东 曾吉 +3 位作者 胡元元 李权波 周代翠 向文昌 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第1期31-35,共5页
An analytic massive total cross section of photon proton scattering is derived, which has geometric scaling. A geometric scaling is used to perform a global analysis of the deep inelastic scattering data on inclusive ... An analytic massive total cross section of photon proton scattering is derived, which has geometric scaling. A geometric scaling is used to perform a global analysis of the deep inelastic scattering data on inclusive structure function F2 measured in lepton-hadron scattering experiments at small values of Bjorken x. It is shown that the descriptions of the inclusive structure function F2 and longitudinal structure function FL are improved with the massive analytic structure function, which may imply the gluon saturation effect dominating the parton evolution process at HERA. The inclusion of the heavy quarks prevent the divergence of the lepton-hadron cross section, which plays a significant role in the description of the photoproduction region. 展开更多
关键词 of on in Geometric Scaling Analysis of Deep Inelastic Scattering Data Including Heavy Quarks that is data been have than from
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Specific Heat of a Unitary Fermi Gas Including Particle-Hole Fluctuation 认领 引用
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作者 阮小霞 宫昊 +1 位作者 石远美 宗红石 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第11期25-27,共3页
We investigate the particle-hole fluctuation correction to the specific heat of an ultracold Fermi gas at unitarity within the framework of the non-self-consistent T-matrix approximation in the normal phase. We find g... We investigate the particle-hole fluctuation correction to the specific heat of an ultracold Fermi gas at unitarity within the framework of the non-self-consistent T-matrix approximation in the normal phase. We find good agreement between our theoretical predictions and the experimental data measured by the MIT group, apart from discrepancies near the transition temperature. At high temperature, our calculated specific heat has the tendency to approach the specific heat of the Boltzmann gas. 展开更多
关键词 of in is Specific Heat of a Unitary Fermi Gas Including Particle-Hole Fluctuation BEC BCS from heat
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Constraining Equation of State of Dark Matter:Including Weak Gravitational Lensing 认领 引用 被引量：2
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作者 杨磊 杨维强 徐立昕 《Chinese Physics Letters》 SCIE EI CAS CSCD 2015年第5期183-187,共5页
Usually the equation of state （EoS） of dark matter is zero when it is cold, however there exists the possibility of a （effective） nonzero EoS of dark matter due to its decay and interaction with dark energy. In th... Usually the equation of state （EoS） of dark matter is zero when it is cold, however there exists the possibility of a （effective） nonzero EoS of dark matter due to its decay and interaction with dark energy. In this work, we try to constrain the EoS of dark matter/JAdm using the currently available cosmic observations which include the geometrical and dynamical measurements. For the geometrical measurements, the luminosity distance of type Ia supernovae, the angular diameter distance and comoving sound horizon from baryon acoustic oscillations and the cosmic microwave background radiation will be employed. The data points from the redshift-space distortion and weak gravitational lensing will be taken as dynamical measurements. Using the Markov chain Monte Carlomethod, we obtain a very tight constraint on the-EoS of dark matter：wdm=0.0000532 ＋0.000692＋0.00136＋0.00183 -0.000686-0.00136-0.00177. 展开更多
关键词 In Constraining Equation of State of Dark Matter:Including Weak Gravitational Lensing Planck
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Anterior transhepatic approach for total caudate lobectomy including spigelian lobe,paracaval portion and caudate process:A Brazilian experience 认领 引用 被引量：1
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作者 Eduardo de Souza Martins Fernandes Carlo Alberto Pacilio +1 位作者 Felipe Pedreira Tavares de Mello Camila Liberato Girão 《Hepatobiliary & Pancreatic Diseases International》 SCIE CAS CSCD 2018年第4期371-373,共3页
To the Editor:Nowadays,because of the infiltration of cholangiocarcinoma to the parenchyma and/or bile ducts of the caudate lobe,the inclusion of caudate lobe combined with a major hepatectomy remains the gold standar... To the Editor:Nowadays,because of the infiltration of cholangiocarcinoma to the parenchyma and/or bile ducts of the caudate lobe,the inclusion of caudate lobe combined with a major hepatectomy remains the gold standard approach for a resectable hilar cholangiocarcinoma.Since the last years of the 20th century,some authors have begun to report isolated caudate lobe resection for hepatocellular. 展开更多
关键词 HCC Anterior transhepatic approach for total caudate lobectomy including spigelian lobe paracaval portion and caudate process:A Brazilian experience
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INTRALUMINAL ELASTIC CIRCULAR LIGATION FOR ESOPHAGOGASTRIC ANASTOMOSIS(INCLUDING THE CLINICAL ANALYSES OF 100 CASES) 认领 引用
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作者 张毓德 杜喜群 +1 位作者 王其彰 张增强 《Chinese Journal of Cancer Research》 CAS 1989年第2期51-55,共5页
Between 1981 and 1988, 234 cases of cancerof the esophagus or gastric cardia were treatedby resection and intraluminal elastic circularligation for esophagogastric anastomosis. Thispresent study advances the results d... Between 1981 and 1988, 234 cases of cancerof the esophagus or gastric cardia were treatedby resection and intraluminal elastic circularligation for esophagogastric anastomosis. Thispresent study advances the results described inour earlier study. The details of technicalrefinements are here reported, based on the 展开更多
关键词 INTRALUMINAL ELASTIC CIRCULAR LIGATION FOR ESOPHAGOGASTRIC ANASTOMOSIS INCLUDING THE CLINICAL ANALYSES OF 100 CASES
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Morphological Assessment of the Small Intestine of Broilers Fed Dietary Natural Zeolite Including Plant Extract 认领 引用 被引量：2
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作者 T. Incharoen O. Khambualai K. Yamauchi 《Journal of Agricultural Science and Technology(A)》 2011年第8期1284-1287,共4页
Many kinds of feed additives （e.g., probiotics, prebiotics, antibiotics, etc.） can be used in chicken diets to stimulate intestinal morphological maturation and, consequently, intestinal function. The aim of this tr... Many kinds of feed additives （e.g., probiotics, prebiotics, antibiotics, etc.） can be used in chicken diets to stimulate intestinal morphological maturation and, consequently, intestinal function. The aim of this trial was to investigate the possibility that natural zeolite including plant extract （ZEM） could encourage the hypertrophy of intestinal villi and the absorptive function of epithelial cells in broiler chickens. At 7 days old, 64 male Marshall Chunky broilers were divided into four groups, each with four replicates of four chickens. The birds were fed a basal mash diet supplemented with ZEM at 0% （control）, 0.05%, 0.1%, and 0.2% for 42 days. At 49 days old, four chickens from each treatment were killed to obtain intestinal samples. Morphological intestinal assessment was conducted using both a light and a scanning electron microscope. A tendency to increased villus height and cell area could be observed throughout the intestinal segments of the broilers fed ZEM. Particularly, the villus height in the duodenum was significantly increased （P 〈 0.05） in the 0.05% ZEM group when compared with the control group. The area of the villus cells tended to be higher in the ZEM groups in all intestinal regions and showed a significant increase （P 〈 0.05） in the ileal part of the 0.2% ZEM group. Also, the assessment of cells mitosis in the intestinal crypts showed significantly higher numbers （P 〈 0.05） in all levels of ZEM groups in the duodenum and a tendency to increase in value in the jejunum and ileum, as compared with the control group. More protuberated cells and multi-cell clusters were found in the ZEM groups than in the control group, resulting in a rough cellular surface. In conclusion, the present study might suggest that the intestinal villi and epithelial cells on the villus apical surface are hypertrophied in the ZEM groups, and that intestinal villi adapt to enhance their absorption capacity by increasing the absorptive surface area. These results are indicated that ZEM can provide effective nutritive value when used as a feed additive. 展开更多
关键词 Broiler chicken natural zeolite including plant extract intestinal morphology
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AROMATIC BOND INCLUDING METALLIC ATOM IN COORDINATE COMPOUNDS AND SOME OF ITS PROPERTIES 认领 引用
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作者 Jing Jiang LIU Yun Ti CHENDepartment of Chemistry,Nankai University,Tianjin,300071R.Kent MURMANNDepartment of Chemistry,University of Missouri Columbia MO 65211,U.S.A 《Chinese Chemical Letters》 SCIE EI CAS 1992年第5期363-366,共4页
Aromatic bond including metallic atom (Ni) is investigated by EHMO calculation.The NMR spectra and the mechanism for hydrolysis are discussed on the ground of results of computation.
关键词 Ni PN AROMATIC BOND INCLUDING METALLIC ATOM IN COORDINATE COMPOUNDS AND SOME OF ITS PROPERTIES ITS
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On the Hadronuclear Origin of the Te V Emission of Ap Librae 认领 引用
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作者 Zhao-Hua Xie Lei-Ming Du +2 位作者 Yun-Bing Xu Rui Xue Ze-Rui Wang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第2期356-361,共6页
We investigate the origin of the very-high-energy(VHE;100 GeV)γ-ray emission from the low-synchrotronpeaked BL Lac object Ap Librae within the framework of a one-zone hadronuclear(pp)interaction model.Conventional le... We investigate the origin of the very-high-energy(VHE;100 GeV)γ-ray emission from the low-synchrotronpeaked BL Lac object Ap Librae within the framework of a one-zone hadronuclear(pp)interaction model.Conventional leptonic and hadronic scenarios(including photohadronic processes and proton synchrotron emission)have encountered difficulties in reproducing the unusually broad GeV??TeV spectrum of this source without invoking extreme physical conditions.In this work,we construct a one-zone pp model that incorporates both leptonic and hadronuclear components and apply it to fit the multiwavelength spectral energy distribution of Ap Librae.Our results show that the optical-GeV emission can be well explained by leptonic emission from primary electrons,while the Te V emission is naturally accounted for byγ-rays from neutral pion decay in pp interactions.The required total jet power is found to be -1.8×1046erg·s-1,which corresponds to half of the Eddington luminosity of the central supermassive black hole.Compared with previous hadronic models that demand superEddington energetics,our approach provides a more physically reasonable explanation for the VHE spectrum of Ap Librae. 展开更多
关键词 leptonic hadronic scenarios including one zone model emission gevtev spectrum hadronuclear TeV photohadronic processes Ap Librae
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Peripheral nervous system and gut microbiota:Emerging evidence on increased mechanistic understanding to reveal innovative strategies for peripheral nerve regeneration 认领 引用
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作者 Giulia Ronchi Matilde Cescon +1 位作者 Giovanna Gambarotta Kirsten Haastert-Talini 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第4期1560-1561,共2页
The gut microbiota:The human body is colonized by a diverse and complex microbial community–including bacteria,viruses,archaea,and unicellular eukaryotes–that plays a central role in human wellbeing.Indeed,microbiot... The gut microbiota:The human body is colonized by a diverse and complex microbial community–including bacteria,viruses,archaea,and unicellular eukaryotes–that plays a central role in human wellbeing.Indeed,microbiota is crucial for several functions,including host metabolism,physiology,maintenance of the intestinal epithelial integrity,nutrition,and immune function,earning it the designation of a“vital organ”(Guinane and Cotter,2013). 展开更多
关键词 unicellular eukaryotes human wellbeing gut microbiota peripheral nerve regeneration microbial community peripheral nervous system microbial community including host metabolism
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Cassiterite U-Pb dating of the Nasarawa lithium deposit,Central Nigeria 认领 引用
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作者 Gao-jie Liu Xiang-ping Chen +7 位作者 Peng-fei Wang Jian-qing Wang Yu-yu Tang Peng Hu Liang Cao Jun-sheng Jiang Binta Fatima Etsu Ji-kun Wang 《China Geology》 CAS CSCD 2026年第1期217-218,I0024,共2页
1.Objective Nigeria lies between the West African Craton and the Congo Craton,south of the Tuareg Shield(Ogunmola JK et al.,2015).The Nasarawa pegmatite field mainly comprises of the Precambrian Basement Complex(inclu... 1.Objective Nigeria lies between the West African Craton and the Congo Craton,south of the Tuareg Shield(Ogunmola JK et al.,2015).The Nasarawa pegmatite field mainly comprises of the Precambrian Basement Complex(including Archean-Proterozoic migmatite,gneiss,schists and Pan-African “Older Granites”),Mesozoic alkaline ring complexes(“Younger Granites”) and sedimentary basins(Yang QD et al.,2023;Fig.1a).“Older Granites” are part of the Pan-African mobile belt;“Younger Granites” has significant peralkaline characteristics.“Younger Granites” has a wide distribution in the north-central region of Nigeria,including areas such as Kano,Jos-Bauchi,Mada,and Nasarawa,and the emplacement age gradually decreases from north to south from 213 Ma(Dutse complex) to 141 Ma(Afu complex)(Amuda AK et al.,2021). 展开更多
关键词 peralkaline chara precambrian basement complex including west african craton congo cratonsouth alkaline ring complexes younger sedimentary basins yang nasarawa pegmatite field cassiterite
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The Formation of Electron-capture Supernovae:A Review 认领 引用
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作者 Bo Wang Dongdong Liu +1 位作者 Yunlang Guo Zhanwen Han 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第3期1-14,共14页
It is generally believed that the electron-capture reactions happen when the oxygen-neon(ONe)cores grow in masses close to the Chandrasekhar limit,leading to the formation of neutron stars(NSs)via electron-capture sup... It is generally believed that the electron-capture reactions happen when the oxygen-neon(ONe)cores grow in masses close to the Chandrasekhar limit,leading to the formation of neutron stars(NSs)via electron-capture supernovae(EC-SNe).EC-SNe are predicted to be the most likely short-lived and faint optical transients,and a small ejecta mass is expected during the collapse.This kind of SNe provide a distinct channel for producing isolated NSs and NS systems,especially for the formation of X-ray binaries and double NSs.Although EC-SNe were proposed∼45 yr ago,there are still some uncertainties for the origin of EC-SNe and their productions.In this article,we review recent studies on the two classic progenitor channels of EC-SNe,i.e.,the single star channel and the binary channel.In the single star channel,EC-SNe can happen in super asymptotic giant branch stars or He stars,whereas in the binary channel EC-SNe can occur in He stars in binaries(involving He star+MS systems and NS+He star systems)or accretion-induced collapse in white dwarf binaries(involving the singledegenerate scenario and the double-degenerate scenario).Recent progress on these two progenitor channels is discussed,including the initial parameter range for EC-SNe,the evolutionary paths to EC-SNe,related objects and some observational constraints,etc.We also make some discussions on the possible candidates for EC-SNe in this article,and the impacts of EC-SNe on some research fields,e.g.,the properties of NSs,double NS population and chemical products,etc.It is noting that EC-SNe show some similar properties with ultra-stripped SNe,e.g.,low ejecta masses and small kicks.Accordingly,we also discuss the difference between these two types of SNe in this article.Research on EC-SNe is at a pivotal stage,with key theoretical uncertainties and observational challenges requiring integrated modeling and multi-wavelength observations for robust identification. 展开更多
关键词 stars evolution-(stars:)binaries general-(stars:)binaries(including multiple) close-(stars:)supernovae general
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An Ultra-low Mass Ratio Contact Binary:WISE J095035.2+354215 认领 引用
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作者 Fen Liu Difu Guo +1 位作者 Yuxin Han Changming Zhang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第4期170-177,共8页
We present the first observational analysis of the totally eclipsing binary WISE J095035.2+354215(hereafter J095035),a system whose mass ratio lies near the theoretical stability limit for binary stars.Fundamental ste... We present the first observational analysis of the totally eclipsing binary WISE J095035.2+354215(hereafter J095035),a system whose mass ratio lies near the theoretical stability limit for binary stars.Fundamental stellar parameters of the system were determined through spectral energy distribution fitting,yielding a surface gravity of log g=4.16-0.29+0.34cm s-2,a metallicity of[Fe/H]=0.05-0.06+0.08dex,and an effective temperature of Teff=6262-34+43K.Employing the PHOEBE 2.4 software package with a Markov Chain Monte Carlo sampling technique,we derived photometric parameters from multiband observations,confirming that J095035 is an overcontact binary with an ultra-low mass ratio(q≈0.064)and a contact degree of 47%.Synthesizing eclipse timing data from our observations and multiple astronomical surveys,we determined that J095035’s orbital period is experiencing a secular decline at dP/dt-3.70×10-7day yr-1.This secular orbital period variation is most likely driven by the joint influence of two key physical processes:mass exchange between the binary’s constituent stars and angular momentum leakage from the entire system.The sustained orbital period reduction triggers shrinkage of the critical Roche lobes,thereby enhancing the contact depth and ultimately directing the system toward coalescence into a fast-rotating merger product. 展开更多
关键词 (stars:)binaries eclipsing-(stars:)binaries(including multiple) close-stars individual(WISE J095035.2+354215)
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Cooperative perception,decision,and control of intelligent group systems 认领 引用
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作者 Fang DENG Zhengtao DING Wei DONG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第7期1-2,共2页
Intelligent Group Systems(IGSs),including Unmanned Aerial Vehicles(UAVs),Unmanned Ground Vehicles(UGVs),and space-based platforms,have fundamentally transformed modern aerospace engineering.These multi-agent systems a... Intelligent Group Systems(IGSs),including Unmanned Aerial Vehicles(UAVs),Unmanned Ground Vehicles(UGVs),and space-based platforms,have fundamentally transformed modern aerospace engineering.These multi-agent systems are highly valued for their operational flexibility and distributed robustness.Traditional single-agent design paradigms are no longer sufficient for such systems,especially in dynamic,highly adversarial,or resource-constrained environments. 展开更多
关键词 Control Unmanned Ground Vehicles Space Based Platforms intelligent group systems igss including unmanned aerial vehicles uavs unmanned ground vehicles ugvs Cooperative Perception Unmanned Aerial Vehicles Decision
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LINEAR 16694484:A Short-period,Low-mass-ratio Totally Eclipsing Binary with a Decreasing Orbital Period 认领 引用
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作者 Difu Guo Raul Michel +2 位作者 Xiang Gao Fen Liu Changming Zhang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第6期119-127,共9页
We conduct a multiband photometric investigation of LINEAR 16694484,a low-mass-ratio contact binary system featuring an orbital period of 0.2492762 days,close to the theoretical lower limit for contact systems.Utilizi... We conduct a multiband photometric investigation of LINEAR 16694484,a low-mass-ratio contact binary system featuring an orbital period of 0.2492762 days,close to the theoretical lower limit for contact systems.Utilizing the PHOEBE modeling suite combined with Markov Chain Monte Carlo sampling,we analyze multiband light curves and infer a fill-out factor of~33%.Complementarily,analysis of Transiting Exoplanet Survey Satellite photometric data yields consistent results,confirming the system's overcontact configuration.The rare combination of such a short orbital period and an extremely low mass ratio(q≈0.11)renders this system a valuable testbed for probing binary evolution theories.By combining new eclipse timings with archival data from multiple sky surveys,we detect a secular decrease in the orbital period at a rate of P=dP/dt=-5.11×10−7day·yr−1,most plausibly attributed to mass transfer from the more massive primary component to the less massive secondary.As the system undergoes progressive orbital contraction,the Roche lobe radii are reduced,which intensifies the contact degree and establishes LINEAR 16694484 as a plausible progenitor of a contact binary merger event. 展开更多
关键词 (stars:)binaries:eclipsing (stars:)binaries(including multiple):close stars:individual(LINEAR 16694484)
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Formation of Extremely Low-mass White Dwarfs in Wide Orbits 认领 引用
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作者 Yangyang Zhang Zhenwei Li Xuefei Chen 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第2期218-223,共6页
Helium white dwarfs(WDs)with masses less than 0.3 M⊙are known as extremely low-mass WDs(ELM WDs),which cannot be produced by single stellar evolution in theory.Generally,these stars are believed to form through bi... Helium white dwarfs(WDs)with masses less than 0.3 M⊙are known as extremely low-mass WDs(ELM WDs),which cannot be produced by single stellar evolution in theory.Generally,these stars are believed to form through binary interactions.Recently,two ELM WDs in unusually wide orbits were reported,i.e.,KIC 8145411 and HE0430-2457.Their orbital separations are too wide to be produced by the binary evolution scenario.In this work,we study the formation of wide-orbit ELM WD binaries from hierarchical triple systems.In this scenario,an ELM WD is formed from the inner binary and subsequently forms a wide binary system with the third object.We find that the merger of an evolved star with a brown dwarf in the inner binary fails to produce single ELM WDs,but Type Ia supernovae(SNe Ia)explosions can successfully do so.Furthermore,we investigate the impact of the supernova explosion on the orbital distribution of the surviving binary and find that this channel may have a probability of reproducing the orbital parameters of HE 0430-2457,but fails to reproduce the observed features of KIC 8145411.This supports recent observational recalibrations suggesting that KIC 8145411 resides in a triple system rather than a binary. 展开更多
关键词 (stars)binaries(including multiple) close-stars evolution-(stars) white dwarfs
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Studies on G-type Low-mass Active Contact Binaries from TESS and SuperWASP Photometry 认领 引用
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作者 Yuangui Yang Shuang Wang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第4期35-48,共14页
Based on the photometric data from Transiting Exoplanet Survey Satellite(TESS)and Wide Angle Search for Planets(SuperWASP),we conducted a detailed study of four solar-type contact binaries.Continuous light curves,char... Based on the photometric data from Transiting Exoplanet Survey Satellite(TESS)and Wide Angle Search for Planets(SuperWASP),we conducted a detailed study of four solar-type contact binaries.Continuous light curves,characterized by intrinsic variability,offer valuable insights into the migration and evolution of cool spots.With the Wilson-Devinney program,we deduced photometric solutions for these binary systems,and then derived their spot parameters.For V829 Her and V839 Cen,notably,the spot emerges,disappears,and reemerges over the observing time.We determined 1515 eclipse timings(ETs)from TESS and 226 from SuperWASP observations.The(O-C)curves,constructed from all available ETs,all exhibited upward parabola trends with cyclic oscillations.The modulation periods,ranging from one to two dozen years,were attributed to the light-time effect via the presence of a third body.Therefore,four solar-type contact binaries may form hierarchical triple-stellar systems. 展开更多
关键词 (stars:)binaries(including multiple) close-(stars:)starspots-stars fundamental parameters-stars individual(V829 Her,V839 Cen,V1055 Sco and AE Phe)
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