On the Possible Bipolar Nature of 21 Micron IRAS Sources
Abstract
The discovery of another IRAS source (22574 + 6609) showing the unidentified 21-micron emission feature is reported. Its overall energy distribution is similar to the well-known edge-on bipolar nebulae AFGL 2688 and AFGL 618. Ground-based optical and infrared observations of this object and two other 21-micron sources show that while all three have very similar infrared properties, they differ greatly in the visual region. All three of these 21-micron sources are intrinsically similar bipolar nebulae, viewed at different orientations.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1991
- DOI:
- 10.1086/169720
- Bibcode:
- 1991ApJ...368..564H
- Keywords:
-
- Infrared Sources (Astronomy);
- Nebulae;
- Spectral Energy Distribution;
- Stellar Envelopes;
- Asymptotic Giant Branch Stars;
- Infrared Astronomy Satellite;
- Interstellar Chemistry;
- Stellar Evolution;
- Astrophysics;
- INFRARED: SOURCES;
- STARS: CIRCUMSTELLAR SHELLS;
- STARS: MASS LOSS