Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348705m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #487.05; Bulletin of the American Astronomical Society, Vol. 41, p.461
Astronomy and Astrophysics
Astronomy
Scientific paper
Spitzer Space Telescope IRAC and MIPS images have revealed an unusual, slightly elongated ring a few dozen arcsec in diameter, with a well-defined gap in one side. Ring material appears to be streaming away from the gap as if expelled from inside the ring. This object has not been previously studied, has not been detected in radio surveys, and no optical source has been cataloged near its coordinates. The object's form has some resemblance to that of planetary nebulae. The great majority of planetary nebulae are aspherical. Although the mechanism responsible for the aspherical shapes is not generally agreed-upon, it has been suggested that short-lived jets during the post-AGB phase which impact the expanding shell may account for some or all of the deformations. The IR colors of this object place it on the evolutionary track of post-AGB objects. I suggest that this is a post-AGB object in which the central star is still optically obscured, and that the deformation may be indirect evidence of a jet (possibly no longer present) which has created a hole in the preplanetary nebular shell.
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