1999ApJ...517L..43L

Query : 1999ApJ...517L..43L

1999ApJ...517L..43L - Astrophys. J., 517, L43-L46 (1999/May-3)

Milliarcsecond change of IM Pegasi radio position in 1 hour coincident with sharp rise in flux density.

LEBACH D.E., RATNER M.I., SHAPIRO I.I., RANSOM R.R., BIETENHOLZ M.F., BARTEL N. and LESTRADE J.-F.

Abstract (from CDS):

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 (Δα, Δδ)=(-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.

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Journal keyword(s): Astrometry - Stars: Binaries: Close - Radio Continuum: Stars - Stars: Activity - Stars: Individual: Constellation Name: IM Pegasi - Techniques: Interferometric

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* IM Peg RS* 22 53 02.2663977960 +16 50 28.300547040   7.024 5.890     K2III 357 1
2 OHIO Y 184 Rad 22 53 06.7 +19 42 50           ~ 4 0
3 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2

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