Abstract
view Abstract Citations (53) References (46) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS HCN Emission toward CRL 2688: Evidence for Angular Momentum Transport in a Circumstellar Envelope Bieging, John H. ; Nguyen-Quang-Rieu Abstract The authors have mapped the J = 1 - 0 emission line of HCN toward the bipolar circumstellar envelope CRL 2688 (the "Egg Nebula") with 5" angular resolution and 2 km s-1 velocity resolution. The HCN emission is strongly concentrated at the midpoint of the two optical lobes, with fainter extensions along the optical dark lane. The HCN morphology is consistent with a toroidal density distribution for the gas, with the highest densities in the plane of the optical dark lane. The velocity field of the HCN emission shows to main features: (1) a gradient along the bipolar axis consistent with outflow which has higher velocity at the poles than at the equator; and (2) a gradient along the optical dark lane indicating a significant rotational component. Publication: The Astrophysical Journal Pub Date: January 1988 DOI: 10.1086/165911 Bibcode: 1988ApJ...324..516B Keywords: Angular Momentum; Emission Spectra; Hydrocyanic Acid; Momentum Transfer; Nebulae; Stellar Envelopes; Angular Resolution; Astronomical Maps; Brightness Temperature; Molecular Clouds; Stellar Mass Ejection; Stellar Spectrophotometry; Astrophysics; INTERSTELLAR: MOLECULES; NEBULAE: INDIVIDUAL ALPHANUMERIC: CRL 2688; STARS: CIRCUMSTELLAR SHELLS; STARS: MASS LOSS full text sources ADS | data products SIMBAD (1)
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