Results 11 to 20 of about 256 (175)
Radio Astrometry at Different Frequencies
The Astronomical JournalThe very long baseline interferometry technique allows us to determine the positions of thousands of radio sources using the absolute astrometry approach. I have investigated the impacts of a selection of observing frequencies in a range from 2 to 43 GHz
Leonid Petrov
doaj +2 more sources
VLBI MultiView Astrometry of Radio Stars
Proceedings of 15th European VLBI Network Mini-Symposium and Users' Meeting — PoS(EVN2022), 2023 The expected emission mechanisms for radio loud M dwarfs include plasma emission, gyrosynchrotron emission during short lived (<2 hrs) flares, and Electron Cyclotron Maser Instability (ECMI) which can occur in planetary aurorae, and interaction between a star and a planetary companion.
Boven, E.P. +3 more
openaire +3 more sources
Photographic astrometry of radio stars [PDF]
Monthly Notices of the Royal Astronomical Society, 1991 Photographic astrometry of four radio stars has been carried out in a test program using the Wide Field Camera at the f/8 focus of the Jacobus Kapteyn Telescope (JKT). The accuracy of the positions is 0.04 arcsec. Comparisons are made with positions obtained by the Carlsberg and Bordeaux automatic meridian circles and with the radio positions measured ...
R. W. Argyle +3 more
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RADIO ASTROMETRY OF THE TRIPLE SYSTEMS ALGOL AND UX ARIETIS [PDF]
The Astrophysical Journal, 2011 We have used multi-epoch long-baseline radio interferometry to determine the proper motion and orbital elements of Algol and UX Arietis, two radio-bright, close binary stellar systems with distant tertiary components. For Algol, we refine the proper motion and outer orbit solutions, confirming the recent result of Zavala et al.
Peterson, W. M. +4 more
openaire +6 more sources
Symposium - International Astronomical Union, 1984 Radio astrometry is now the premier astrometric technique for measuring the positions of celestial objects. The precision with which absolute positions can be determined is approaching a few milliarc-seconds. The progress towards establishing an almost inertial reference frame based upon the positions of extragalactic radio sources is reviewed as of ...
openaire +1 more source
RADIO ASTROMETRY OF THE CLOSE ACTIVE BINARY HR 5110 [PDF]
The Astrophysical Journal, 2015 The close active binary HR 5110 was observed at six epochs over 26 days using a global VLBI array at 15.4~GHz. We used phase-referencing to determine the position of the radio centroid at each epoch with an uncertainty significantly smaller than the component separation.
Abbuhl, E. +3 more
openaire +4 more sources
The Use of the Ratan-600 Radio Telescope in Astrometry [PDF]
Symposium - International Astronomical Union, 1986 The RATAN-600 radio telescope (Kaidanovsky & al. 1972) was designed for solving various problems of astrophysics and radiophysics (Pariisky & al. 1972, Gelfreikh & al. 1972). Because of its high resolving power and large collecting area, this instrument can be used to measure accurate positions of radio sources.
P. M. Afanasieva +5 more
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Optical and radio astrometry of the galaxy associated with FRB 150418 [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2016 Abstract A fading radio source, coincident in time and position with the fast radio burst FRB 150418, has been associated with the galaxy WISE J071634.59−190039.2. Subsequent observations of this galaxy have revealed that it contains a persistent, but variable, radio source. We present e-Multi-Element Radio Linked Interferometer Network,
Bassa, C. G. +12 more
openaire +6 more sources
Radio and Optical Astrometry [PDF]
Symposium - International Astronomical Union, 1974 Radio positional measurements have achieved an accuracy as high as that of optical astrometry, with uncertainties no greater than a few hundredths of an arc second in each coordinate. Declinations and relative right ascensions are determined absolutely.
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VLBI Astrometry of Radio-Emitting Stars [PDF]
Symposium - International Astronomical Union, 1995 High-accuracy astrometric VLBI observations of 7 radio stars are presented with applications to the connection between the Hipparcos and VLBI extragalactic reference frames, to the identification of the radio emitting region in the ternary system Algol and the detectabity of Jupiter-size planet orbiting the radio star σ2 CrB.
J.-F. Lestrade +6 more
openaire +1 more source