Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198l...1l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. L1-L4.
Astronomy and Astrophysics
Astrophysics
41
Planetary Nebulae, Radio Emission, Stellar Envelopes, Aromatic Compounds, Carbon Isotopes, Carbon Monoxide, Cyclic Hydrocarbons, Formyl Ions, Millimeter Waves
Scientific paper
Very strong radio emission from CO (J = 1-0 and 2-1) and weak emission from HCO+ and 13CO have been detected with the IRAM 30 m telescope in the cold IRAS point source, IRAS 21282+5050, which was recently identified as a very compact planetary nebulae. It has been noted for having unusually strong infrared features between 3 and 15 μm, tentatively attributed to PAH molecules. Negative results on several other molecules were obtained. Among circumstellar outflows from evolved stars, IRAS 21282+5050 has the largest known ratio of CO emission intensity to far IR flux, perhaps because its luminosity has undergone a sharp, recent decline. Its 12CO(2-1) emission exhibits a high velocity wing and appears to be spatially extended (≡10arcsec) and symmetric. IRAS 21282+5050 has the largest measured 12CO/13CO brightness temperature ratio (≡100).
Forveille Thierry
Likkel Lauren
Morris Marita
Omont Alain
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