Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..235h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 235-238.
Astronomy and Astrophysics
Astronomy
12
Faint Object Camera, Hubble Space Telescope, Interstellar Matter, Radio Emission, Radio Jets (Astronomy), Very Large Array (Vla), Accretion Disks, Binary Stars, Companion Stars, Comparison, Mass Transfer, Mira Variables, Shock Fronts
Scientific paper
Several models of the R Aqr northeast jet have been proposed which attempt to explain the presence of shock excitation, resulting in a confusing picture of this nearest astrophysical jet. This paper compares observations of the jet in the R Aqr system with the HST's Faint Object Camera (FOC) and radio continuum images acquired with the VLA. The forbidden-O III jet structure is derived from restored FOC imagery, which has been convolved with an elliptical Gaussian of the same size as the restoring beam of the 6-cm VLA maps, allowing image comparison at the same spatial resolution. It is found that, at increasing distances from the central star, the forbidden O III emission knots that comprise the optical jet occur at systematically larger position angles when compared with corresponding features in the radio images. The angular separation of forbidden O III and radio continuum emission can be understood in terms of a shock formed when ejecta in the stream interacts with previously existing circumstellar material and subsequently cools by nebular line emission.
Hollis Jan. M.
Michalitsianos Andrew G.
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