Carbon monxoide in proto-planetary nebulae

Details Carbon monxoide in proto-planetary nebulae Carbon monxoide in proto-planetary nebulae

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...196l...5b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 196, no. 1-2, May 1988, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

75

Carbon Monoxide, Interstellar Gas, Planetary Nebulae, Spectral Emission, Infrared Stars, Photodissociation, Red Giant Stars

Scientific paper

A search for molecular emission in several objects which present the characteristics of proto-planetary nebulae, has been carried out by using the IRAM 30-m dish at Pico Veleta (Spain). The molecular envelope associated with CRL 618 has been mapped in the J = 1-0 and J = 2-1 lines of CO. In NGC 2346 the CO emission has been found to be extended and forming a remarkable molecular outflow. CO (J = 1-0) emission, although weak, has been also detected in M2-9 (Butterfly nebula), and marginally in HD 44179 (the Red Rectangle). Some other objects known to show CO emission, have been reobserved in order to be compared with the newly detected objects. The differences found in the CO emission from one PPN to another, are interpreted in terms of photodissociation of CO by stellar ultraviolet radiation.

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