VLA observations of NH3 and HC7N in the EGG Nebula (CRL 2688) - The shell kinematics

Details VLA observations of NH3 and HC7N in the EGG Nebula (CRL 2688) - The shell kinematics VLA observations of NH3 and HC7N in the EGG Nebula (CRL 2688) - The shell kinematics

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...165..204n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 165, no. 1-2, Sept. 1986, p. 204-210. Research supported by the Naturvetenskap

Astronomy and Astrophysics

Astrophysics

50

Cosmology, Interstellar Matter, Reflection Nebulae, Acetyl Compounds, Ammonia, Cyanides, Infrared Stars, Phased Arrays, Protoplanets

Scientific paper

The authors have used the VLA to map the Egg Nebula in the inversion line (1, 1) of NH3 and the rotation line J = 21-20 of HC7N, simultaneously. Besides the determination of the geometry of the circumstellar shells in both transitions, the interferometric observations have also revealed that the kinematics of the molecular shells departs from a pure expansion. Most of the NH3 emission arises in a disk and more probably a toroid oriented almost edge-on and lying along the dark lane separating the two optical lobes. The infrared object is located at the centre of the NH3 disk. The HC7N shell which is probably an oblate spheroid appears as a halo surrounding the infrared source and extends beyond the optical lobes. The strong asymmetry observed in the NH3 spectra and position-velocity maps can be attributed to an anisotropic blueshifted motion similar to a bipolar flow originating from the central infrared object.

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