干涉技术在天体测量中的应用  

Interferometric Technique and its Application on Astrometry

作　　者：金文敬[1] 

机构地区：[1]中国科学院上海天文台,上海200030

出　　处：《天文学进展》2007年第4期346-363,共18页Progress In Astronomy

基　　金：国家自然科学基金项目(10333050;10373021);LAMOST工程课题(合同号00BJK003);中国科学院知识创新重要方向项目(KJCX2-SW-T1);上海市科学技术委员会资助项目(06DZ22101)

摘　　要：介绍了射电、光学和红外波段地面干涉的仪器以及近期的进展,如厘米波段的VLBA、EVLA、SKA等;毫米波段的ALMA、CARMA等;光学波段的Keck、VLTI/PRIMA,CHARA、MarkⅢ、NPOI、LBTI等.叙述了目前干涉技术在空间天体测量中应用的一些研究项目。如射电波段的VSOP、iARISE、RadioAstro;光学波段的HST/FGS、SIM PlanetQuest等.探讨了干涉技术在天体测量中的有关研究课题,并概述了其在我国的发展和应用情况.The optical, infrared and radio interferometers, such as VLBI, VLA, SKA in centimeter band and ALMA, CARMA in millimeter band and VLTI/PRIMA, CHARA, Mark Ⅲ, NPOI, LBTI in optical band, are introduced. The application of interferometric technique for space strometry, such as VOSP, ARISE, RadioAstro mission in radio band and HST/FGS, SIM in optical band, is presented. The research topics using interferometric technique in the field of astrometry are given as follows： 1） Establishment and maintenance of extragalactic radio reference frame. In order to improve the positional accuracies of radio sources the following work should be done： （1） In the VLBI data processing the influence of structure by using structure index should be estimated. Now the structure index of 557 radio sources are given; （2） The observations of radio sources in ICRF will be made in high frequency in order to reduce the influence of structure; （3） the theoretical tropospheric mode should be improved and the short-term tropospheric delay fluctuations will be considered; （4） the influence about 10μas in position and 7μas/a in proper motion due to the gravitational lensing induced by disk stars Massive Astrophysical Compact Halo Objects （MA- CHO） in our galaxy will be considered. The number of radio sources in ICRF should be increased through VCS and MASIV program. 2） Linkage between reference frames. The optical and radio interferometers such as NIERLIN, VLA and HST are used for link of two reference frames. The linkage between radio and dynamical reference frame will be determined by observations for pulsars. 3） Determination of distance. The positions of H20 and OH maser sources relative to positions of extragalactic radio sources are determined with the phase referencing technique in the observations of the VLBA, EVN, VERA, VLA. The accuracy of parallax determined by referencing technique of radio observations is 0.01 mas within 10 kpc which equals to that obtained from Gaia. So it has opened a new era o

关 键 词：天体测量学 干涉技术 天球参考架 地外行星 双星 

分 类 号：P129[天文地球—天体测量]