An OH survey of very cold IRAS point sources.
Abstract
A radio telescope survey of 84 IRAS point sources was carried out at all four 18-cm transitions of the OH radical in order to find protoplanetary nebulae (PPN). Emission or absorption was detected from 13 sources. Of these, nine are compact H II regions or star formation regions and four are PPN. High angular resolution observations of both H II regions and PPN are needed to provide information on the geometry and dynamics of the dust and gas envelope.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 1991
- Bibcode:
- 1991A&A...248..209T
- Keywords:
-
- H Ii Regions;
- Hydroxyl Emission;
- Infrared Sources (Astronomy);
- Infrared Stars;
- Planetary Nebulae;
- Star Formation;
- Asymptotic Giant Branch Stars;
- Infrared Astronomy Satellite;
- Point Sources;
- Radio Telescopes;
- Stellar Envelopes;
- Astrophysics