CO Structure of the 21 Micron Source IRAS 22272+5435: A Sign of a Jet Launch?

Abstract

We report the results of radio interferometric observations of the 21-micron source IRAS 22272+5435 in the CO J=2-1 line. 21-micron sources are carbon-rich objects in the post-AGB phase of evolution which show an unidentified emission feature at 21 micron. Since 21-micron sources usually also have circumstellar molecular envelopes, the mapping of CO emission from the envelope will be useful in tracing the nebular structure. From observations made with the Combined Array for Research in Millimeter-wave Astronomy (CARMA), we find that a torus and spherical wind model can explain only part of the CO structure. An additional axisymmetric region created by the interaction between an invisible jet and ambient material is suggested.

31 pages, 13 figures; accepted for publication in ApJ; full resolution version is available from http://web.hku.hk/~junichi/paper/

References in corpus (4)

• A mid-infrared imaging catalogue of post-AGB stars
• High Velocity Precessing Jets from the Water Fountain IRAS 18286-0959 Revealed by VLBA Observations
• First detection of CO lines in a water fountain star
• Three-Dimensional Structure of the Central Region of NGC7027: A Quest for Trails of High-Velocity Jets

Cited by in corpus (7)

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• Molecular gas in 21 and 30 micron sources: the 2\,mm and 1.3\,mm spectra of IRAS\,21318+5631 and 22272+5435
• Do Water Fountain Jets Really Indicate the Onset of the Morphological Metamorphosis of Circumstellar Envelopes?
• Multi-band polarimetry of post-asymptotic giant branch stars stars. Optical measurements
• The detection of heavy metals in the circumstellar envelopes of post-AGB stars