Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246l.141h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 246, June 15, 1981, p. L141-L145.
Astronomy and Astrophysics
Astronomy
183
Astronomical Models, Binary Stars, Radio Jets (Astronomy), Radio Stars, Stellar Mass Ejection, Stellar Rotation, Antenna Arrays, Radio Astronomy, Stellar Models, Synchrotron Radiation, Variable Stars, Very Long Base Interferometry
Scientific paper
Four epochs of 4885 MHz VLA maps of SS 433 are used to show that the structure and changes in structure of the 0.1-5.0 arcsec size scale radio emission conform to a kinematic model for the proper motion of ejected radio emitting material. It is pointed out that this model is an extension of the kinematic twin-jet model for the optical jets of SS 433. The following model parameters are shown to give the best fit to all the data: the axis about which the jets rotate is inclined 80 deg to the line of sight in position angle 100 deg; the angle between the jets and the jet rotation axis is 20 deg; the jets rotate in a clockwise (left-handed) sense about the jet axis with a period of 164 days; the oppositely directed eastern and western jet rotation axes are on the near and far sides, respectively, of the central object; the ratio of constant jet velocity and the distance to SS 433 is 3.0 + or - 0.2 arcsec/yr; and the present capability of the radio data to determine an absolute jet velocity indicates a value of 0.26 times the speed of light and thus a distance of 5.5 kpc.
Hjellming Robert M.
Johnston Ken J.
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