CO observations of the expanding envelope of IRC + 10216

Details CO observations of the expanding envelope of IRC + 10216 CO observations of the expanding envelope of IRC + 10216

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..408k&link_type=abstract

Astrophysical Journal, vol. 204, Mar. 1, 1976, pt. 1, p. 408-414.

Astronomy and Astrophysics

Astronomy

74

Carbon Monoxide, Infrared Spectra, Interstellar Gas, Line Shape, Astronomical Models, Astronomical Spectroscopy, Infrared Astronomy, Molecular Spectra

Scientific paper

The paper reports high-sensitivity observations of (C-12)O and (C-13)O in the infrared source IRC + 10216, which were made with the NRAO 11-m telescope at frequencies of 115.2712 and 110.2014 GHz, respectively. The emission-line profiles are found to be in good qualitative agreement with model profiles predicted for a spherically symmetric and uniformly expanding envelope. Analysis of the profile shapes indicates that the (C-12)O line is optically thick, while the (C-13)O line is both optically thin and double-peaked. It is shown that the shape of the (C-12)O line is determined largely by the motion of the gas and that the expansion velocity at the edges of the CO cloud is 15 km/s, in contrast to 12 km/s for more centrally confined molecules. Based on the estimated (C-13)O content, the envelope mass is estimated to be 0.5 solar mass.

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