Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19311105l&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #111.05; Bulletin of the American Astronomical Society, Vol. 30, p.1420
Astronomy and Astrophysics
Astronomy
Scientific paper
VLBI continuum observations at 3.6 cm of the RS Canum Venaticorum binary star IM Pegasi (HR 8703) on 1997 January 16--17 and 18--19, made in support of the NASA-Stanford Relativity Gyroscope Experiment (Gravity Probe B), revealed ~ 1 mas motions of its radio centroid over time periods as short as ~ 1 h. These motions, which we deduced from phase-delay measurements using a Kalman-filter estimator, coincided temporally with changes in the star's flux density measured with the VLA. Phase-referenced maps of the stellar radio emission show motions consistent with those found with the Kalman-filter estimator. We present our estimates of source motion as a function of time during our observations, and discuss the corresponding evolution of the structure seen in our phase-referenced maps. We also discuss what we may learn from additional VLBI observations of the star, which we continue to make at the rate of ~ 4 per year.
Bartel Norbert
Bietenholz Michael F.
Lebach Daniel Eugene
Lestrade Jean-Francois
Ransom Ryan R.
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