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IRAS 18333-2357 - an unusual source in M22
Gillett, F. C.; Neugebauer, G.; Emerson, J. P.; Rice, W. L.
AA(Kitt Peak National Observatory, Tucson, AZ), AB(California Institute of Technology, Pasadena), AC(Queen Mary College, London, England), AD(California Institute of Technology, Jet Propulsion Laboratory, Pasadena)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. 722-728. NASA-supported research. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Astronomical Spectroscopy, Globular Clusters, Infrared Astronomy, Planetary Nebulae, Point Sources, Abundance, Carbon, Infrared Spectra, Infrared Stars, Planetary Evolution, Radiant Flux Density, Spectral Energy Distribution
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IRAS 18333-2357 is a pointlike source located about 1arcmin from the center of the globular cluster M22 (NGC 6566). Its infrared colors are cooler than virtually all OH/IR stars and hotter than almost all galaxies. If the source is physically associated with M22, its infrared luminosity is 700 L_sun; and the dust mass in the radiating region is in the range 6×10-4 to 1×10-2M_sun;. It is speculated that IRAS 18333-2357 may be in a very early phase of planetary nebulae evolution. One possible model for the source is that of a rapidly evolving bipolar nebula, similar to OH 0739-14, with carbon abundance enriched by more than 20 times compared to abundances in M22 as a whole.

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