VLBI astrometric identification of the radio emitting region in Algol and determination of the orientation of the close binary

Details VLBI astrometric identification of the radio emitting region in Algol and determination of the orientation of the close binary VLBI astrometric identification of the radio emitting region in Algol and determination of the orientation of the close binary

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...410..808l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 410, no. 2, p. 808-814.

Astronomy and Astrophysics

Astronomy

52

Astrometry, Binary Stars, K Stars, Radio Emission, Radio Sources (Astronomy), Very Long Base Interferometry, Hertzsprung-Russell Diagram, Identifying, Stellar Activity, Stellar Magnetic Fields, Stellar Orbits, Subgiant Stars

Scientific paper

A 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.

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