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VLBI astrometric identification of the radio emitting region in Algol and determination of the orientation of the close binaryA minute displacement of the radio source in Algol was measured by VLBI during two consecutive orbital revolutions of the close binary. The magnitude of the displacement unambiguously indicates that the less massive star of the close binary, a K subgiant, is the star responsible for the nonthermal radio emission of the system. This is consistent with the idea that the radio emission in Algol is related to the strong magnetic activity of the subgiant. The orientation and sense of the displacement on the sky that are directly deduced from our astrometric VLBI observations imply: (1) that the orbital plane of the close binary is at P.A. = +52 deg +/- 5 deg; and (2) that the sense of circulation of the close binary is clockwise, as seen on the sky. Thus, the long-period and close binary orbital motions are almost orthogonal and counterrevolving and this is relevant for evolution and dynamical studies.
Document ID
19930057116
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lestrade, Jean-Francois
(JPL, Pasadena, CA; Meudon Observatoire, France)
Phillips, Robert B.
(Haystack Observatory Westford, MA, United States)
Hodges, Mark W.
(Owens Valley Radio Observatory Big Pine, CA, United States)
Preston, Robert A.
(JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
June 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 410
Issue: 2
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
93A41113
Distribution Limits
Public
Copyright
Other

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