检索结果-南通市图书馆

平动点线性稳定条件及阻力对限制性三体问题三角平动点线性稳定性的影响

在线全文

学校读者我要写书评

暂无评论

天文学报 2004年第3期45卷 301-309页

作者：舒斯会陆本魁刘福窑陈务深中国科学院紫金山天文台

给出了受摄限制性三体问题平动点线性稳定性的一些判断条件,条件只与相应的平动点切映像的特征方程系数有关,使用方便.用这些判断条件,讨论了一些阻力对经典限制性三体问题三角平动点线性稳定性的影响,改进了Murray等的一些结果.

关键词：天体力学限制性三体问题平动点稳定性阻力

A comparison of co-temporal magnetograms obtained with the Huairou magnetograph and the Spectro-Polarimeter on board Hinode

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2009年第11期52卷 1707-1712页

作者： WANG Dong ZHANG Mei li hui ZHANG HongQi Key Laboratory of Solar Activity National Astronomical ObservatoryChinese Academy of SciencesBeijing 100012China purple mountain observatory Chinese Academy of SciencesNanjing 210008China

We have compared a set of co-temporal magnetograms obtained with the Solar Magnetic Field Tele-scope (SMFT) of the Huairou Solar Observing Station (HSOS) and with the Spectro-Polarimeter of the Solar Optical Telescope (SP/SOT) on board Hinode to check the linear calibrations of SMFT vector magnetograms. The comparison shows that the currently used calibration coefficients of the SMFT have under-estimated the flux density and that a center-to-limb variation of the calibration coefficients was not taken into account by previous calibrations.

关键词： atmosphere magnetic fields magnetic fields

The dynamical architecture and habitable zones of the quintuplet planetary system 55 Cancri

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2009年第6期9卷 703-711页

作者： Jiang-hui Ji Hiroshi Kinoshita lin liu Guang-Yu li purple mountain observatory Chinese Academy of Sciences Nanjing 210008 China national Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China national Astronomical observatory Mitaka Tokyo 181--8588 Japan Department of Astronomy Nanjing University Nanjing 210093 China

We perform numerical simulations to study the secular orbital evolution and dynamical structure of the quintuplet planetary system 55 Cancri with the self-consistent orbital solutions by Fischer and coworkers. In the simulations, we show that this system can be stable for at least 108 yr. In addition, we extensively investigate the planetary configuration of four outer companions with one terrestrial planet in the wide region of 0.790AU 〈 a 〈 5.900AU to examine the existence of potential asteroid structure and Habitable Zones （HZs）. We show that there are unstable regions for orbits about 4：1, 3.1 and 5：2 mean motion resonances （MMRs） of the outermost planet in the system, and several stable orbits can remain at 3.2 and 1：1 MMRs, which resembles the asteroid belt in the solar system. From a dynamical viewpoint, proper HZ candidates for the existence of more potential terrestrial planets reside in the wide area between 1.0 AU and 2.3.AU with relatively low eccentricities.

关键词： celestial mechanics -- methods n-body simulations -- planetary systems -- stars individual (55 Cancri)

The calibration and initial results of the HeI D3.line flash spectrum obtained during the 2008 total solar eclipse

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2009年第11期52卷 1799-1805页

作者： li hui JI HaiSheng NI HouKun ZHANG HaiYing ZHANG YaNan liU HongRui DENG YuanYong WANG DongGuang DU QiuSheng ZHOU Tuanhui li JingWei SHEN JinHua purple mountain observatory 2 Nanjing 210008China nanjing Institute of Astronomical Optics&Technology Nanjing 210042China national Astronomical Observatories of China Beijing 100012China

The flash spectra in the HeI D3.line were obtained during the 2008 total solar eclipse. This paper describes the instrument and the calibration of the obtained flash spectrum, and presents our initial results. The average integrated intensity is Eave = 8.13.1013.erg·cm-1· s-1·ster-1 at h = 1100 km, which confirms that the HeI D3.emission is negatively correlated with the solar activity. The surface brightness reaches a maximum of F ave = 8.25×105 erg·cm-2·s-1·ster-1 at about h ≈ (1290 ± 75) km and then decreases exponentially with height when h >1800 km with an exponential index β = 1.63.10-8 cm-1.

关键词： total solar eclipse flash spectrum spectral line

Revisit of Dynamical Mechanisms of Transporting Asteroids in the 3.1 Resonance to the Near-Earth Space

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Astronomy and Astrophysics 2007年第1期7卷 148-154页

作者： Jiang-hui Ji lin liu purple mountain observatory Chinese Academy of Sciences Nanjing 210008 Department of Astronomy Nanjing University Nanjing 210093 national Astronomical Observatories Chinese Academy of Sciences Beijing 100012

It is well-known that the asteroids in the main belt trapped in the 3.1 Mean Motion Resonance （MMR） with Jupiter （at semi-major axes -2.5 AU） are few in number, forming one of the so-called Kirkwood Gaps. Wisdom pointed out that chaotic motion of such aster- oids can increase their eccentricities and make them approach and cross the orbit of Mars （or even the Earth）. We numerically investigated the orbital evolution of the asteroids involved in 3.1 MMR （NEOs） over millions of years and revisited the dynamical mechanisms of trasporitng such asteroids into the NEO region. The results show that the dynamical evolution of the asteroids around 2.5 AU is mainly dominated by the 3.1 resonance, the v5 and v6 secular resonances and the Kozai resonance, and these bodies can evolve into NEOs through several of the dynamical mechanisms, so indicating possible dynamical origin of the NEOs.

关键词： celestial mechanics-near-Earth Objects-mean motion resonance-secular resonance

On the radial velocity calibrations in the LAMOST medium-resolution spectroscopic survey of nebulae

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第3期21卷 1-14页

作者： Juan-Juan Ren Hong Wu Chao-Jian Wu Wei Zhang Jian-Jun Chen Chih-Hao Hsia Fan Yang Chao liu Jian-Rong Shi Yu-Zhong Wu hui Zhu Bin li Zhong-Rui Bai Hao Tian Yong-hui Hou CAS Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China national Astronomical Observatories Chinese Academy of SciencesBeijing 100101China State Key Laboratory of Lunar and Planetary sciences Macao University of Science and TechnologyTaipaMacaoChina University of chinese academy of sciences Beijing 100049China purple mountain observatory Chinese Academy of SciencesNanjing 210008China University of Science and Technology of China Hefei 230026China nanjing Institute of Astronomical Optics&Technology National Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

Accurate radial velocity determinations of optical emission lines(i.e.,[NⅡ]λλ6548,6584,Hαand[SⅡ]λλ6717,673.)are very important for investigating the kinematic and dynamic properties of *** second stage survey program of Large sky Area Multi-Object fiber Spectroscopic Telescope(LAMOST)has started a sub-survey of nebulae(MRS-N)which will spectroscopically observe the optical emission lines of a large sample of nebulae near the Galactic *** now,15 MRS-N plates have been observed from September 2017 to June *** on fitting the sky emission lines in the red band spectra of MRS-N,we investigate the precision of wavelength calibration and find there are systematic deviations of radial velocities(RVs)from~0.2 to 4 km s^(-1) for different *** for the plates obtained in March 2018,the systematic deviations of RVs can be as large as~4 km s^(-1),which then go down to~0.2-0.5 kms^(-1) at the end of 2018 and January *** RV calibration function is proposed for these MRS-N plates,which can simultaneously and successfully calibrate the systematic deviations and improve the precision of RVs.

关键词： ISM:general ISM:kinematics and dynamics technique:spectroscopic technique:radial velocities

在线全文

学校读者我要写书评

暂无评论

风暴洋晚期玄武岩厚度及规模研究

天文学报 2018年第2期59卷 15-30页

作者：胡晓依陈媛张迅与李少林夏学齐吴昀昭中国科学院紫金山天文台南京210008 中国科学院行星科学重点实验室南京210008 中国地质大学(北京) 北京100083 中国科学院国家天文台北京100012 澳门科技大学太空科学研究所澳门999078

风暴洋是月球最大的月海,分布着大面积的晚期(爱拉托逊纪)玄武岩,是研究月球晚期岩浆活动的良好场所.了解月球晚期玄武岩的厚度、体积乃至喷发通量对于了解风暴洋乃至月球晚期的热演化具有重要意义.爱拉托逊纪玄武岩富橄榄石和钛铁矿,... 详细信息

风暴洋是月球最大的月海,分布着大面积的晚期(爱拉托逊纪)玄武岩,是研究月球晚期岩浆活动的良好场所.了解月球晚期玄武岩的厚度、体积乃至喷发通量对于了解风暴洋乃至月球晚期的热演化具有重要意义.爱拉托逊纪玄武岩富橄榄石和钛铁矿,其下伏的雨海纪玄武岩富辉石,这两类玄武岩的光谱特征差异十分明显,极易通过高光谱数据进行地层识别.基于月球矿物制图仪(Moon Mineralogy Mapper,M3.数据判断撞击坑是否穿透上覆地层,利用撞击坑挖掘法研究风暴洋爱拉托逊纪玄武岩的厚度,并绘制风暴洋地区晚期玄武岩的高分辨率厚度分布图.结果表明:风暴洋爱拉托逊纪玄武岩的平均厚度约为(24±2)–(88±2)m,最大厚度出现在阿利斯塔克坑(Aristarchus)西部,大多超过60 m,最小厚度值分布于研究区最南部,厚度约为28–3. m.嫦娥五号预定着陆区(吕姆克山,Mons Rumker)附近的厚度约为3.–3. m.马里厄斯坑(Marius)以东的区域厚度约为3.–45 m,远小于Weider等人所估测的100–3.0 m.风暴洋地区暴露的爱拉托逊纪玄武岩总体积约为1.3.×10~4km3.仅占风暴洋地区玄武岩总体积的1.6%,表明爱拉托逊纪玄武岩浆活动较之雨海纪已极大减弱.

关键词：月球风暴洋晚期玄武岩厚度撞击坑挖掘深度法

LAMOST Medium-Resolution Spectral Survey of Galactic Nebulae(LAMOST MRS-N):An overview of scientific goals and survey plan

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2021年第4期21卷 243-252页

作者： Chao-Jian Wu Hong Wu Wei Zhang Juan-Juan Ren Jian-Jun Chih-Hao Hsia Yu-Zhong Wu hui Zhu Bin li Yong-hui Hou Jun-lin Wang Shuo-Ran Yu CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China CAS Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China national Astronomical Observatories Chinese Academy of SciencesBeijing 100101China State Key Laboratory of Lunar and Planetary sciences Macao University of Science and TechnologyTaipaMacaoChina purple mountain observatory Chinese Academy of SciencesNanjing 210008China University of Science and Technology of China Hefei 230026China nanjing Institute of Astronomical Optics &TechnologyNational Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

Since Sep.2018,LAMOST has started the medium-resolution(R~7500)spectral survey(MRS).We proposed the spectral survey of Galactic nebulae,including HⅡregions,HH objects,supernova remnants,planetary nebulae and the special stars with MRS(LAMOST MRS-N).LAMOST MRS-N covers about 1700 square degrees of the northern Galactic plane within 40°

关键词： surveys ISM:general ISM:HII regions ISM:Herbig-Haro objects ISM:planetary nebulae: ISM:supernova remnants Galaxy:disk

The Data Processing of the LAMOST Medium-resolution Spectral Survey of Galactic Nebulae(LAMOST MRS-N Pipeline)

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第7期22卷 224-234页

作者： Chao-Jian Wu Hong Wu Wei Zhang Yao li Juan-Juan Ren Jian-Jun Chen Chih-Hao Hsia Yu-Zhong Wu hui Zhu Bin li Yong-hui Hou CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China national Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China State Key Laboratory of Lunar and Planetary sciences Macao University of Science and TechnologyTaipaMacaoChina purple mountain observatory Chinese Academy of SciencesNanjing 210008China University of Science and Technology of China Hefei 230026China 8 nanjing Institute of Astronomical Optics&Technology National Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China

The Large sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST) medium-resolution spectral survey of Galactic Nebulae(MRS-N) has conducted for more than three years since 2018 September and observed more than190 thousand nebular spectra and 20 thousand stellar ***,there is not yet a data processing pipeline for nebular *** significantly improve the accuracy of nebulae classification and their physical parameters,we developed the MRS-N *** article presented in detail each data processing step of the MRS-N Pipeline,such as removing cosmic rays,merging single exposure,fitting sky light emission lines,wavelength recalibration,subtracting skylight,measuring nebular parameters,creating catalogs and packing ***,a description of the data products,including nebular spectra files and parameter catalogs,is provided.

关键词： surveys catalogs methods:data analysis ISM:general