The molecular structure of CRL 618

Details The molecular structure of CRL 618 The molecular structure of CRL 618

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260..283p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 283-292.

Astronomy and Astrophysics

Astrophysics

12

Astronomical Spectroscopy, Carbon Monoxide, Carbon Stars, Molecular Flow, Symbiotic Stars, Asymptotic Giant Branch Stars, Molecular Structure, Radio Spectra

Scientific paper

Spectroscopy and mapping of the type I postmain-sequence source CRL 618, taken with the 45-m antenna of the Nobeyama Radio Observatory and the 12-m NRAO facility at Kitty Peak, are presented. It is shown that the exterior constant velocity envelope has a typical aspect ratio of about 0.8, extends over a range not less than 70 arcsec, and has an FWHM close to about 50 arcsec. Spatial-velocity maps through the nucleus reveal appreciable asymmetries in right ascension, with emission peaking towards about V(lsr) of -25 km/s for easterly offset locations, and about -15 km/s towards the west. These characteristics may arise from a mix of transverse expansion in the bipolar lobes, radial expansion within the outflow cavities, and shock deceleration of the interior H I/H II wind.

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