The optical/infrared counterpart(s) of IRAS 18333-2357

Details The optical/infrared counterpart(s) of IRAS 18333-2357 The optical/infrared counterpart(s) of IRAS 18333-2357

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..862g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 862-874. Research supported by the California Insti

Astronomy and Astrophysics

Astronomy

47

Blue Stars, Globular Clusters, Infrared Sources (Astronomy), Planetary Nebulae, Red Giant Stars, Absorption Spectra, Abundance, Emission Spectra, Infrared Astronomy Satellite, Ionized Gases, Stellar Spectrophotometry

Scientific paper

Observations of the potential optical counterparts of the unusual source IRAS 18333-2357 are reported. There are three distinct optical objects located within roughly 2 arcsec of the IR source: a red star, a very blue star, and an extended emission line nebulosity. IRAS 18333-2357 indeed appears to be physically associated with the Galactic globular cluster M22, and while it probably should be considered a PN, its very small nebular mass and extreme abundance anomalies are very unusual among known PNe. IRAS 18333-2357 does not appear to be at an early stage of PN evolution, but instead may be in a late stage. The lack of an associated radio or H-alpha source is the result of abundance anomalies in the source.

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