VLBI Imaging of the Gravity Probe B Guide Star IM Pegasi

Details VLBI Imaging of the Gravity Probe B Guide Star IM Pegasi VLBI Imaging of the Gravity Probe B Guide Star IM Pegasi

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5006r&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #50.06; Bulletin of the American Astronomical Society, Vol. 31, p.897

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Multi-epoch VLBI observations at 3.6 cm have been made of the RS CVn binary star IM Pegasi (HR 8703) in support of the NASA-Stanford relativity gyroscope experiment, Gravity Probe B (GP-B). We present images of IM Peg produced from observations between January 1997 and August 1998. The images show a variety of radio emission structures. Phase-referenced maps from temporal subsets of the individual observing sessions show the evolution of the stellar emission structure over the period of each observation (12-15 hours). In particular, during several of our sessions we detected apparent source motions on the order of 1 mas on time scales of several hours. We discuss our astrophysical understanding of IM Peg and examine the implications of our results for the GP-B experiment.

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