New merlin observations of OH/IR stars: OH357.31-1.33 and OH0.9+1.3     

V. Migenes  E. Lüdke  R. J. Cohen  M. Shepherd  P. F. Bowers 《Astrophysics and Space Science》1995,224(1-2):515-516

We present recent radio interferometer measurements of the OH 1612 MHz maser emission from the OH/IR sources OH0.9+1.3 and OH357.31 obtained with the enhanced MERLIN. Some preliminary results are briefly discussed. These results are part of an on-going observational campaign to obtain the best radio maps of bright OH/IR stars with MERLIN, VLA and VLBA, in order to understand the nature and dynamics of their circumstellar matter and evolution.  相似文献   

Precise geodesy with the Very Long Baseline Array   总被引：2，自引：2，他引：0  

Leonid Petrov  David Gordon  John Gipson  Dan MacMillan  Chopo Ma  Ed Fomalont  R. Craig Walker  Claudia Carabajal 《Journal of Geodesy》2009,83(9):859-876

We report on a program of geodetic measurements between 1994 and 2007 which used the Very Long Baseline Array (VLBA) and up to ten globally distributed antennas. One of the goals of this program was to monitor positions of the array at a 1 mm level of accuracy and to tie the VLBA into the international terrestrial reference frame. We describe the analysis of these data and report several interesting geophysical results including measured station displacements due to crustal motion, earthquakes, and antenna tilt. In terms of both formal errors and observed scatter, these sessions are among the very best geodetic very long baseline interferometry experiments.  相似文献