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Identification of temperature anomaly RR Lyrae stars in LAMOST survey,misclassification and binarities

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Research in Astronomy and Astrophysics 2020年第6期20卷 239-252页

作者： lin-Jia Li Sheng-Bang Qian Jia Zhang Jia-Jia He Li-Ying Zhu yunnan observatories Chinese Academy of SciencesKunming 650216China Key laboratory of the structure and evolution of celestial objects Chinese Academy of SciencesKunming 650216China Center for astronomical Mega-Science Chinese Academy of SciencesBeijing 100101China University of chinese academy of sciences Beijing 100049China

RR Lyrae stars,a well-known type of pulsating variable stars,have been known about for more than a century.A large amount of photometric data on RR Lyrae stars has been accumulated by space-and ground-based sky surveys,but the spectral data are relatively ***,the LAMOST sky survey project provides an opportunity to view them from the point of view of *** collect the atmospheric parameters of 1685 RR Lyrae stars provided by the LAMOST catalog,and carry out research by using the reliable *** find that there is a clear correlation between their Teff and pulsation periods,which is consistent with the pulsation and evolution theories of RR Lyrae *** addition,we focus on those RR Lyrae stars with abnormal *** analyzing the data from several photometric surveys,we find that some of these temperature anomalies are misclassified variable stars(e.g.,eclipsing binaries,pulsating stars on main sequence),and some are RR Lyrae binary *** the latter,the temperatures of potential companions should be lower and their luminosities should not be neglected(e.g.,red giant stars).We obtain that the ratio of temperature anomaly stars to all the sample stars is 4%,which means that the impact on the further analysis(e.g.,kinematics analysis)is *** also present the catalogs of spectral anomaly RR Lyrae stars.

关键词： techniques spectroscopic-techniques photometric-stars fundamental parameters-stars variables RR Lyrae

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两个太阳爆发事件中磁重联电流片的观测研究

天文学报 2015年第6期56卷 598-615页

作者：蔡强伟吴宁林隽中国科学院云南天文台昆明650011 中国科学院大学北京100049 云南师范大学旅游与地理科学学院昆明650031

日冕物质抛射(Coronal Mass Ejection,CME)通常会将其后面区域中的磁场急剧拉伸,使得极性相反的磁力线相互靠近而形成磁重联电流片.磁重联电流片在爆发过程中,既是磁自由能迅速转化为热能、等离子动能和高能粒子束流的重要区域,又起着... 详细信息

日冕物质抛射(Coronal Mass Ejection,CME)通常会将其后面区域中的磁场急剧拉伸,使得极性相反的磁力线相互靠近而形成磁重联电流片.磁重联电流片在爆发过程中,既是磁自由能迅速转化为热能、等离子动能和高能粒子束流的重要区域,又起着连接日冕物质抛射和耀斑的作用.2.03年1月3日和11月4日的两次CME事件,在CME离开太阳表面附近之后,均有电流片被观测到.结合搭载在SOHO(Solar and Heliospheric observatory)上的LASCO(Large Angle and Spectrometric Coronagraph)、UVCS(Ultraviolet Coronagraph Spectrometer)数据,以及大熊湖天文台和云南天文台的Hα资料,研究两次爆发事件的动力学特征,以及电流片的物理特性.电流片中高电离度粒子的存在,如Fe^(+17)、Si^(+11),表明电流片区域中温度高达3×10~6～5×10~6K.直接测量发现电流片的厚度在1.3×10~4～1.1×10~5km范围之间,并随时间先增大后逐渐减小.利用CHIANTI(ver 7.1)光谱代码,进一步计算得到2.03年1月3日电流片中的电子温度和相应辐射量(Emission Measure,EM)的均值分别为3.86×10~6K和6.1×10^(2.)cm^(-5).另一方面,利用SOHO/UVCS观测数据对2.03年11月4日的CME爆发事件中的电流片进行分析,发现电流片呈现准周期性扭转运动.

关键词：太阳日冕物质抛射太阳电流片太阳辐射量太阳紫外辐射

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太阳抵近探测计划——观测位置的新突破

上海航天（中英文） 2024年第5期41卷 1-10页

作者：林隽陆希陈雨豪黄帆张珅毅张艺腾周斌葛振华刘鎏田晖何建森程鑫陈鹏飞白先勇季海生刘佳佳张晓世中国科学院云南天文台云南昆明650216 中国科学院天文大科学研究中心北京100012 中国科学院大学天文与空间科学学院北京100049 云南省太阳物理与空间目标监测重点实验室云南昆明650216 上海卫星工程研究所上海201109 中国科学院国家空间科学中心北京100190 昆明理工大学材料科学与工程学院云南昆明650031 中国科学院微小卫星创新研究院上海201203 北京大学地球与空间科学学院北京100871 南京大学天文与空间科学学院江苏南京210093 中国科学院国家天文台北京100101 中国科学院紫金山天文台江苏南京210023 中国科技大学地球与空间科学学院安徽合肥230026 云南大学物理天文学院云南昆明650500

太阳抵近探测计划(SCOPE)旨在突破高温和强辐射防护、长距离运载、远距离轨道控制和先进载荷等一系列极限技术,将探测器投送至距太阳中心仅有5个太阳半径的位置上,深入太阳大气层进行探测,研究太阳附近极亮、极热的深空探测“无人区”,... 详细信息

太阳抵近探测计划(SCOPE)旨在突破高温和强辐射防护、长距离运载、远距离轨道控制和先进载荷等一系列极限技术,将探测器投送至距太阳中心仅有5个太阳半径的位置上,深入太阳大气层进行探测,研究太阳附近极亮、极热的深空探测“无人区”,在全新的位置上对太阳进行超近距离原位探测和遥感观测,针对磁场和等离子体结构实现空间分辨率优于0.1"的观测。探测器将穿越太阳爆发磁重联电流片,显微观测太阳爆发磁结构,原位探测磁重联电流片、日冕物质抛射与激波以及各类带电粒子,以推动揭示太阳爆发理论机理。探测器将在最靠近太阳的区域显微监测和探测日冕中尺度小于0.1"的纳耀斑、光球中尺度小于0.06"的磁场和速度场结构及其演化特征,确认日冕加热机制;探测太阳风重离子电荷态,确认太阳起源及加速机制。探测器还将在最接近太阳的区域内与原位探测日冕磁场,显微观测太阳极区磁场和等离子体结构和演化特征;揭示太阳附近尘埃分布特征,进入无尘埃区,确定太阳系尘埃盘内边界。困扰太阳物理界近百年的两个科学难题,即太阳爆发机理难题和日冕加热与太阳风加速机理难题,随着该计划的顺利实施将被破解;在最接近日心的位置处实现日冕磁场,包括太阳极区磁场原位探测“0到1”的突破也将实现。本文将介绍SCOPE的背景、科学目标和预期产出、有效载荷以及卫星平台关键技术。

关键词：太阳爆发磁场磁重联中高能粒子原位探测热防护深空通信

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宇宙磁场

物理 2020年第6期49卷 349-358页

作者：韩金林徐钧中国科学院国家天文台北京100101 中国科学院大学北京100049

磁场在宇宙中无处不在,贯穿各种天体。磁场对天体形成、辐射和演化起重要作用,也是宇宙线研究的基础。以前人们对宇宙磁场的理解主要是来自对地球和太阳磁场的测量和物理解释。近2.年来,对宇宙更大尺度天体的磁场测量取得很大进展:发现... 详细信息

磁场在宇宙中无处不在,贯穿各种天体。磁场对天体形成、辐射和演化起重要作用,也是宇宙线研究的基础。以前人们对宇宙磁场的理解主要是来自对地球和太阳磁场的测量和物理解释。近2.年来,对宇宙更大尺度天体的磁场测量取得很大进展:发现了银河系具备沿着银河旋臂的几万光年尺度磁场,强度为2.4μG;发现了银河系晕里具有环向磁场,在银道面上下方向相反;发现了银河系中心有极向磁场的观测证据;发现了邻近旋涡星系可能具有万光年尺度磁场的证据;发现了星系团几千万光年范围内磁场存在的证据。宇宙学模拟也显示在宇宙超大纤维结构中应该有磁场存在。这些磁场可能都是宇宙早期产生并在天体形成和演化过程中得以发扬光大。

关键词：天体磁场银河星系

High amplitude δ Scuti star BO Lyn with evidence of a late A-type companion in an elliptical orbit

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Research in Astronomy and Astrophysics 2018年第1期18卷 119-126页

作者： lin-Jia Li Sheng-Bang Qian Jia Zhang Li-Ying Zhu Wen-Ping Liao yunnan observatories Chinese Academy of Sciences Kunming 650216 China Key Laboratory of the Structure and Evolution of Celestial Objects Chinese Academy of Sciences Kunming 650216 China Center for astronomical Mega-Science Chinese Academy of Sciences Beijing 100012 China University of chinese academy of sciences Beijing 100049 China

We present 145 times of light maximum for high amplitude δ Scuti star BO Lyn based on several sky surveys（CRTS,DASCH,NSVS,OMC and Super WASP）and our photometric *** with the data in literature,a total of 179 times of light maximum are used to analyze the O-C diagram of BO *** find that it can be described by an upward parabolic component and a periodic variation with a period of 34.5±0.1 *** latter could be caused by the light travel time effect as a result of an additional companion orbiting in a highly elliptical orbit（e=0.64±0.03）.Our study indicates that the companion’s luminosity cannot be ignored,and it should be a late A-type main-sequence *** long-term period change of BO Lyn is also detected,and its value,1.52.0.2.×10^（-3）d Myr^（-1）,is consistent with evolutionary *** suggest that more spectroscopic and photometric observations are needed in the future to confirm the nature of the BO Lyn system.

关键词： techniques:photometric stars:variables:δ Scuti stars:individual(BO Lyn)

Photometric investigation of the eclipsing binary TX Herculis observed by LUT

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Research in Astronomy and Astrophysics 2019年第7期19卷 47-52页

作者： Li-Ying Zhu Xiao-Man Tian Xiao Zhou lin-Jia Li Zhi-Hua Wang yunnan observatories Chinese Academy of SciencesKunming 650216China Center for astronomical Mega-Science Chinese Academy of SciencesBeijing 100101China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China University of the chinese academy of sciences Beijing 100049China

The lander of china’s Chang’E-3 spacecraft is equipped with a 15-cm telescope that is very useful for monitoring celestial objects in the ultraviolet(UV) band(2.5–340 nm).The Lunar-based Ultraviolet Telescope(LUT) is the first long-term lunar-based astronomical {2.,that can make uninterrupted observations of a target from the *** we present the continuous complete UV light curve of the eclipsing binary TX Herculis(TX Her).The analysis of the light curve suggests that TX Her is a detached *** dip in the light curve was explained by the emergence of a stellar dark spot on the less massive F0 type *** cyclic change of arrival eclipse times for the system reveals that it contains an additional stellar companion with a minimal mass of 0.35 M⊙ and a period of 48.92.yr,which is supported by the detected light contribution of the third body from light curve *** third body may play an important role in the formation of the present short-period system TX Her.

关键词： stars:binaries:close stars:binaries:eclipsing stars:individuals (TX Herculis) stars:multiple system stars:activity

GABE: Galaxy Assembly with Binary Evolution

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Research in Astronomy and Astrophysics 2019年第10期19卷 121-137页

作者： Zhen Jiang Jie Wang Liang Gao Feng-Hui Zhang Qi Guo Lan Wang jun Pan Key Laboratory for Computational Astrophysics National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Institute of Computational Cosmology Department of PhysicsUniversity of DurhamSouth RoadDurham DH1 3LEUK yunnan observatories Chinese Academy of SciencesKunming 650011China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650011 China

We developed a new semi-analytic galaxy formation model: Galaxy Assembly with Binary Evolution(GABE). For the first time, we introduce binary evolution into semi-analytic models of galaxy formation by using the yunnan-Ⅱ stellar population synthesis model, which includes various binary interactions. When implementing our galaxy formation model onto the merger trees extracted from the Millennium simulation, it can reproduce a large body of observational results. We find that in the local universe, the model including binary evolution reduces the luminosity at optical and infrared wavelengths slightly, but it increases the luminosity at ultraviolet wavelengths significantly, especially in FUV band. The resulting luminosity function does not change very much over SDSS optical bands and infrared band, but the predicted colors are bluer, especially when the FUV band is under consideration. The new model allows us to explore the physics of various high energy events related to the remnants of binary stars, such as type Ia supernovae, short gamma-ray bursts and gravitational wave events, and their relation with host galaxies in a cosmological context.

关键词： galaxies formation一galaxies luminosity function, mass function-galaxies stellar content

chinese sunspot drawings and their digitization–(Ⅱ)accuracy analysis for digitized sunspot hand-drawing records of yunnan {2.

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Research in Astronomy and Astrophysics 2020年第4期20卷 156-162页

作者： Yang Peng Xiao-Yu Luo Shu-Guang Zeng lin-Hua Deng Sheng Zheng Gang-Hua lin Yu-lin Cheng Jin-Ping Tao Yong-Li Feng College of Science China Three Gorges UniversityYichang 443002China yunnan observatories Chinese Academy of SciencesKunming 650216China National astronomical observatories Chinese Academy of SciencesBeijing 100101China Chongqing University of Arts and sciences Chongqing 402160China

Sunspots are the most striking and easily observed magnetic structures of the Sun,and statistical analysis of solar historical data could reveal a wealth of information on the long-term variation of solar activity *** hand-drawn sunspot records of yunnan observatories,{2. academy of sciences have been accumulating for more than 60 years,and nearly 16000 images have been *** the future,the observation mode of recording sunspots by hand-drawing will be replaced inevitably by digital images observed either at ground or in *** connect the hand-drawn sunspot data and the purely digital sunspot data in future,it is necessary to analyze the systematic errors of the data which are observed by the two observation modes in the period of *** this paper,we choose 2.8 round sunspots(Htype in modified Zurich sunspot classification)from the drawing of yunnan observatories to compare their positions and areas with the CCD observations made by Helioseismic and Magnetic Imager(HMI)on board Solar Dynamic observatory(SDO)and Global Oscillation Network Group(GONG).We find that the latitude and longitude accuracy of hand-drawn sunspot are within-0.12. and 2.2. degree respectively,and the area accuracy is about 16.36 sunspot unit(μHem).Systematic errors apparently decrease with large sunspot.

关键词： sunspots methods:data analysis techniques:image processing

Advanced Space-based Solar observatory(ASO-S):an overview

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Research in Astronomy and Astrophysics 2019年第11期19卷 3-10页

作者： Wei-Qun Gan Cheng Zhu Yuan-Yong Deng Hui Li Yang Su Hai-Ying Zhang Bo Chen Zhe Zhang Jian Wu Lei Deng Yu Huang Jian-Feng Yang Ji-jun Cui Jin Chang Chi Wang Ji Wu Zeng-Shan Yin Wen Chen Cheng Fang Yi-Hua Yan jun {2. Wei-Ming Xiong Bin Chen Hai-Chao Bao Cai-Xia Cao Yan-Ping Bai Tao Wang Bing-Long Chen Xin-Yu Li Ye Zhang Li Feng Jiang-Tao Su Ying Li Wei Chen You-Ping Li Ying-Na Su Hai-Yan Wu Mei Gu Lei Huang Xue-jun Tang Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210034China Innovation academy for Microsatellites Chinese Academy of SciencesShanghai 201203China National astronomical observatories Chinese Academy of SciencesBeijing 100101China Nanjing Institute of astronomical Optics&Technology National Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China Changchun Institute of Optics Fine Mechanics and PhysicsChangchun 130033China Xi’an Institute of Optics and Precision Mechanics Chinese Academy of SciencesXi’an 710119China National Space Science Center Chinese Academy of SciencesBeijing 100190China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China yunnan observatories Chinese Academy of SciencesKunming 650011China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 101408China Beijing Special Engineering and Design Institute Beijing 100028China Beijing Institute of Tracking and Telecommunications Technology Beijing 100094China Shanghai academy of Spaceflight Technology Shanghai 201109China

The Advanced Space-based Solar observatory(ASO-S)is a mission proposed for the 2. th solar maximum by the chinese solar *** scientific objectives are to study the relationships between the solar magnetic field,solar flares and coronal mass ejections(CMEs).Three payloads are deployed:the Full-disk vector Magneto Graph(FMG),the Lyman-αSolar Telescope(LST)and the Hard X-ray Imager(HXI).ASO-S will perform the first simultaneous observations of the photospheric vector magnetic field,non-thermal imaging of solar flares,and the initiation and early propagation of CMEs on a single ***-S is scheduled to be launched into a 72. km Sun-synchronous orbit in *** paper presents an overview of the mission till the end of Phase-B and the beginning of Phase-C.

关键词： space vehicles instruments-Sun magnetic fields-Sun flares-Sun CMEs-Sun UV radiation-Sun X-ray,gamma-rays