Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999evga.conf..115b&link_type=abstract
13th Working Meeting on European VLBI for Geodesy and Astrometry, p. 115 - 120
Astronomy and Astrophysics
Astronomy
Scientific paper
Three relativistic models are available in the data analysis software CALC/SOLVE: the Shapiro-, the Hellings- and the Consensus-Model. They all have in common the same starting point, i.e. the motion of a photon is described in a barycentric spacetime and only the subsequent transformation into a geocentric spacetime finally provides the relation between observation and model-quantities. Further these models only supply an observation equation, but an adequate stellar model for the radio sources is missing. Based on this a geocentric modelling with a relativistic stellar model is presented. In order to investigate the new model, different anlyses were made, which finally confirm the general validity of the geocentric relativistic model. Comparing parameter estimations shows that the new model actually yields improved results.
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