Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244l..21g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 1, April 1991, p. L21-L24.
Astronomy and Astrophysics
Astronomy
29
Astronomical Spectroscopy, Carbon Compounds, Interstellar Matter, Radicals, Stellar Composition, Electron Recombination, Line Spectra, Radio Astronomy, Stellar Atmospheres, Stellar Mass Ejection
Scientific paper
The detection in space of HCCN, a radical with an unusual allenic structure, is reported. HCCN is found to be a factor of two more abundant than CH3CN in the circumstellar envelope IRC+10216, but much less abundant than this stable species in the giant clouds Sgr B2 and Orion A. The beam-averaged HCCN column density is 1.2 x 10 to the 13th/sq cm in IRC+10216, = 10 to the 13th/sq cm or less in Sgr B2, and less than 5 x 10 to the 12th/sq cm in Orion A. Two related radicals, CCN and CH2CN, were not detected in IRC+10216; upper limits of 5-7 x 10 to the 13th/sq cm to their column densities are derived. HCCN seems difficult to form like HC3N and the cyanopolyynes from acetylenic ions. Its detection suggests that other members of the HC2nN family could be observed in space.
Cernicharo Jose
Guélin Michel
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