Aperture synthesis observations of molecules in CRL 2688

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Astrophysical Journal; (USA)

OSTI ID:6478789

Bieging, J H; Nguyen-q-rieu, ^[1]

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1. Paris, Observatoire, Meudon (France) California Univ., Berkeley (USA)

Aperture synthesis observations of the line emission of H(C-13)N, HC3N, HNC, and SiS at 33 mm wavelength toward CRL 2688 are presented. The sizes of the molecular envelopes and the molecular abundances are derived from the observations in terms of a model of molecular extinction. The envelopes are elongated east-west and are almost aligned with the direction of the dust lane of the optical nebula. The departure from spherical symmetry is weak and similar to that of HCN, but significantly different from the thin disk structure found for NH3. The sizes of the molecular emission along the major axis are similar. The pedestal observed in the H(C-13)CN spectra may arise from a bipolar outflow or a variable wind corresponding to a fast wind phase from the central object. The abundances of H(C-13)CN, HC3N, and HNC in CRL 2688 are comparable to the peak abundances of IRC +10216. SiS appears to be deficient by an order of magnitude in CRL 2688 with respect to IRC +10216. 29 refs.

• OSTI ID: 6478789
• Journal Information: Astrophysical Journal; (USA), Vol. 359; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
HYDROCYANIC ACID
COSMOCHEMISTRY
INTERSTELLAR SPACE
CHEMICAL COMPOSITION
SILICON SULFIDES
COMPARATIVE EVALUATIONS
COSMIC GASES
ELEMENT ABUNDANCE
EMISSION SPECTRA
GAS FLOW
INTERFEROMETERS
NEBULAE
RED SHIFT
STELLAR WINDS
ABUNDANCE
CHALCOGENIDES
CHEMISTRY
CYANIDES
FLUID FLOW
FLUIDS
GASES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MEASURING INSTRUMENTS
SILICON COMPOUNDS
SPACE
SPECTRA
STELLAR ACTIVITY
SULFIDES
SULFUR COMPOUNDS
640105* - Astrophysics & Cosmology- Galaxies