Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201...95c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 201, Oct. 1982, p. 95-103. Research supported by the Robert A. Welch Fo
Astronomy and Astrophysics
Astronomy
12
Carbon Stars, Infrared Astronomy, Infrared Spectra, Stellar Envelopes, Stellar Spectra, Carbon Monoxide, Chlorine, Fourier Transformation, High Resolution, Hydrogen, Line Spectra, Methane, Signal To Noise Ratios, Spectrometers
Scientific paper
The fundamental vibration-rotation lines of HCl near 3 microns were sought in high-resolution spectra of IRC+10216, obtained with a Fourier transform spectrometer, and an analysis of the CH4 nu3 band was made. The predicted value of the HCl column density, based on the expectation that Cl is fully associated into HCl in the circumstellar shell, is 10 to 20 times greater than the upper limit on the observed column density of HCl-35, which is 2.3 x 10 to the fifteenth/cm2. This discrepancy suggests that Cl is not fully associated into HCl, but rather may reside in another molecule, such as CH3Cl, or a condensate, such as FeCl2 or MgCl2. Although the CH3Cl nu1 band is not present, the limit on its column density does not exclude it as a sink of Cl atoms. CH4 nu3 lines yield a rotational temperature of 160 K plus or minus 25 K, and a column density of 1.8 x 10 to the sixteenth/cm2.
Clegg Robin E. S.
Hinkle Kenneth H.
Lambert David L.
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