Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.355..705l&link_type=abstract
Nature (ISSN 0028-0836), vol. 355, Feb. 20, 1992, p. 705-707.
Astronomy and Astrophysics
Astronomy
16
Mira Variables, Radio Astronomy, Radio Jets (Astronomy), Symbiotic Stars, Three Dimensional Motion, Accretion Disks, Nebulae, Stellar Magnetic Fields, Very Large Array (Vla)
Scientific paper
Radio observations of the symbiotic binary R system R Aquarii, which is surrounded by a complex extended optical nebulosity, show that five out of six bright components in the radio jet have moved. One radio component has the same proper motion as the optical Mira, the primary star of the binary. At a distance of 200 pc, the proper motions of the other components correspond to a tangential velocity of 44-160 km/s with respect to the Mira. A true 3D velocity map of the radio jet is obtained which rules out the possibility that the radio components in the jet were formed in a single explosive event, and suggests instead that they are 'bullets' ejected at about 20-yr intervals into a narrow cone. Alternatively, if the components move along the jet and are accelerated during the whole of their passage through the inner 7 arcsec of the system, ejection at about 40-yr intervals would lead to the disposition observed at present.
Johnson Dean R. H.
Lehto Harry J.
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