Astronomy and Astrophysics – Astrophysics
Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. L1-L4.
Astronomy and Astrophysics
Flow Velocity, Molecular Flow, Planetary Nebulae, Radio Observation, Stellar Mass Ejection, Angular Resolution, Carbon Monoxide, Hydrocyanic Acid, Molecular Gases
An outflow of dense molecular gas with a terminal velocity of about 200 km/s has been detected in high angular resolution radio observations of the protoplanetary nebula CRL 618. The flow is found in the J=2-1 and 1-0 lines of CO. Flow with a smaller velocity span is also detected in several high excitation lines, including the J=25-24 line of HC3N and the J=3-2 lines of HCN and HCO(+). The results suggest that the outflow is bipolar and has a mass of about 0.01 solar mass. In addition, three lines of H2CO are detected in CRL 618.
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