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Title:
The inner beams of SS 433
Authors:
Romney, Jonathan D.; Schilizzi, Richard T.; Fejes, Istvan; Spencer, Ralph E.
Affiliation:
AA(Max-Planck-Institut fuer Radioastronomie, Bonn, Federal Republic of Germany), AB(Stichting Radiostraling van Zon en Melkweg, Dwingeloo, Netherlands), AC(Kozmikus Geodeziai Obszervatorium, Budapest, Hungary), AD(Manchester, Victoria University, Jodrell Bank, England)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 15, 1987, p. 822-831. (ApJ Homepage)
Publication Date:
10/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BEAMS (RADIATION), BINARY STARS, RADIO SOURCES (ASTRONOMY), RADIO STARS, STELLAR FLARES, VERY LONG BASE INTERFEROMETRY, BALLISTIC TRAJECTORIES, COMPUTATIONAL ASTROPHYSICS, FREQUENCY SHIFT, WAVELENGTHS
DOI:
10.1086/165675
Bibliographic Code:
1987ApJ...321..822R

Abstract

European VLBI observations of SS 433 at eight epochs in 1980 and 1981 are reported. The images derived are in excellent agreement with predictions of the 'kinematic model' which posits ballistic motions at mildly relativistic velocity along a cone of directions swept out in a 164-day cycle. By fitting some of the results to the predicted trajectories, a distance to SS 433 of 5.0 + or - 0.5 kpc is derived. The maps exhibit numerous discrete features which appear to be ejected from the center of SS 433 in association with flares in the flux density. These features are often ejected symmetrically, but episodes of one-sided activity are also observed. There is some evidence for wide variations in the aging rate of the ejecta, and for the presence of relatively diffuse emission not associated with flares. Some of the images reveal structures at position angles beyond the cone permitted by the kinematic model.

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