IRAS 18333-2357 - an unusual source in M22

Details IRAS 18333-2357 - an unusual source in M22 IRAS 18333-2357 - an unusual source in M22

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..722g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. 722-728. NASA-supported research.

Astronomy and Astrophysics

Astronomy

34

Astronomical Spectroscopy, Globular Clusters, Infrared Astronomy, Planetary Nebulae, Point Sources, Abundance, Carbon, Infrared Spectra, Infrared Stars, Planetary Evolution, Radiant Flux Density, Spectral Energy Distribution

Scientific paper

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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