Proto-planetary nebulae - The case of CRL 618

Details Proto-planetary nebulae - The case of CRL 618 Proto-planetary nebulae - The case of CRL 618

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204..242b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. 242-252.

Astronomy and Astrophysics

Astrophysics

78

Late Stars, Planetary Nebulae, Protostars, Stellar Composition, Stellar Evolution, Stellar Spectra, Abundance, Millimeter Waves, Molecular Spectra, Photodissociation, Spectrum Analysis, Stellar Envelopes

Scientific paper

The mm-wave emission observed from different molecules in the protoplanetary nebulae CRL 618 and CRL 2688 includes lines whose excitation characteristics indicate that the gas and dust in CRL 618 are significantly hotter than in CRL 2688, OH 231.8+4.2, and IRC+10216. These differences, together with others seen in molecular abundances, are explainable on the assumption that photodissociation by the stellar UV emission is involved in CRL 618; this nebula's age is probably of the order of 200 years, which compares with a transit time of about 1000 years from AGB star to planetary nebula.

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