Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..656b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. 656-667.
Astronomy and Astrophysics
Astronomy
65
Carbon Stars, Hydrocyanic Acid, Infrared Stars, Stellar Composition, Stellar Envelopes, Stellar Mass Ejection, Astronomical Maps, Emission Spectra, Infrared Spectra, Radiative Transfer, Radio Sources (Astronomy), Stellar Models, Vibrational Spectra
Scientific paper
It is pointed out that the remarkable star IRC + 10216, which is extremely luminous in the infrared and yet highly obscured in the visible region, is evidently a late-type carbon star shrouded by a massive envelope of dust and gas. The Hat Creek interferometer has been employed to conduct an aperture synthesis mapping of the 88 GHz (J = 1 to 0) HCN line emission from IRC + 10216. The observational results are compared with the data of statistical equilibrium calculations for the HCN rotational level population for a uniform, constant velocity expansion model for the circumstellar envelope. The results of model calculations are discussed. It is found that the HCN J = 1-0 excitation is dominated by radiative pumping through the 14-micron vibrational transition, in agreement with the conclusions of Kwan and Hill (1977).
Bieging John H.
Chapman Bryan
Welch William J.
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