The Optical/Infrared Counterpart(s) of IRAS 18333-2357
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1989
- DOI:
- 10.1086/167241
- Bibcode:
- 1989ApJ...338..862G
- Keywords:
-
- Blue Stars;
- Globular Clusters;
- Infrared Sources (Astronomy);
- Planetary Nebulae;
- Red Giant Stars;
- Absorption Spectra;
- Abundance;
- Emission Spectra;
- Infrared Astronomy Satellite;
- Ionized Gases;
- Stellar Spectrophotometry;
- Astrophysics;
- CLUSTERS: GLOBULAR;
- INFRARED: SOURCES;
- NEBULAE: PLANETARY;
- STARS: INDIVIDUAL ALPHANUMERIC: IRAS 18333-2357