CRL 618 - The nature of the 200 km/s molecular outflow

Details CRL 618 - The nature of the 200 km/s molecular outflow CRL 618 - The nature of the 200 km/s molecular outflow

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262..544n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. 544-554.

Astronomy and Astrophysics

Astrophysics

50

Line Spectra, Molecular Flow, Planetary Nebulae, Radio Stars, Stellar Evolution, Astronomical Interferometry, Gas Dynamics, Radio Spectra

Scientific paper

The IRAM interferometer was used to map with 2.4 x 3.4 arcsec resolution the J = 1 - 0 HCN line emission in the protoplanetary nebular CRL 618. A model for the high-velocity molecular gas is proposed: it suggests that the emission from the HCN wings is produced by the strong impact of a primary outflow on a few well localized dense clumps in the inner envelope. The formation of high-velocity molecules is estimated at less than 50 yr, and the excitation temperature at 200-1000 K. It is shown that 70 percent of the HCN line emission comes from a very compact, spherically symmetric region. It is shown that the HCN J = 1 - 0 transition in the envelope is mainly collisionally excited and strongly affected by self-absorption.

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