Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...517l..43l&link_type=abstract
The Astrophysical Journal, Volume 517, Issue 1, pp. L43-L46.
Astronomy and Astrophysics
Astronomy
17
Astrometry, Stars: Binaries: Close, Radio Continuum: Stars, Stars: Activity, Stars: Individual: Constellation Name: Im Pegasi, Techniques: Interferometric
Scientific paper
Continuum VLBI observations at 3.6 cm of the RS CVn binary star IM Pegasi (HR 8703) for ~16 hr beginning on 1997 January 16 revealed an apparent motion of the star's radio position that coincided temporally with a large relative change in its flux density. Specifically, a rise in flux density from 18 to 46 mJy in 1.4 hr coincided with a detected position change over that interval of (Deltaalpha, Deltadelta)=(-0.68+/-0.15, 0.55+/-0.20) mas. The magnitude of this position change is much larger than can be explained by parallax, proper motion, and orbital motion and is about two-thirds the estimated angular diameter of the primary component of the binary.
Bartel Norbert
Bietenholz Michael F.
Lebach Daniel Eugene
Lestrade Jean-Francois
Ransom Ryan R.
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