Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..209t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 1, Aug. 1991, p. 209-220.
Astronomy and Astrophysics
Astronomy
36
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
Scientific paper
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.
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