The radial distribution of HC3N molecules in IRC+10216

Details The radial distribution of HC3N molecules in IRC+10216 The radial distribution of HC3N molecules in IRC+10216

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287l...5a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 1, p. L5-L8

Astronomy and Astrophysics

Astronomy

13

Abundance, Molecular Spectra, Organic Compounds, Radial Distribution, Radio Astronomy, Stellar Envelopes, Molecular Excitation, Radio Telescopes, Rotational States, Stellar Models, Vibrational States

Scientific paper

We present sensitive, high resolution maps of HC3N emission in the circumstellar envelope of IRC + 10216. We have mapped the J = 16 - 15, J = 18 - 17 and J = 24 - 23 transitions at 1mm and 2mm wavelength. Contrary to previous maps of lower transitions, they show centrally peaked intensity distributions. We resolve this discrepancy by modelling the vibrational and rotational excitation of HC3N, showing that it largely results from radiative and collisional excitation in the envelope inner layers. The HC3N abundance is changed by this result in the sense that HC3N is more abundant than previously thought. Our new results are compared with chemical models

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