The molecular shell surrounding the compact planetary nebula IRAS 21282+5050

Astronomy and Astrophysics – Astrophysics

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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).

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