The hyperfine structures of HCN J = 1-0 and the implied physical informations. I - S140

Details The hyperfine structures of HCN J = 1-0 and the implied physical informations. I - S140 The hyperfine structures of HCN J = 1-0 and the implied physical informations. I - S140

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.180..151z&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 180, no. 1, June 1991, p. 151-155.

Astronomy and Astrophysics

Astrophysics

1

Astronomical Spectroscopy, Hydrocyanic Acid, Hyperfine Structure, Molecular Clouds, Pre-Main Sequence Stars, Star Formation, Black Body Radiation, Infrared Spectra, Molecular Spectra

Scientific paper

The ratios R(02) and R(12) are calculated based on observations of the hyperfine satellites with a high-resolution spectroscope, and the radiative transfer is determined based on a large-velocity-gradient model, the escape-probability method, and spherical approximation. A density of (0.9 +/- 0.1) x 10 to the 6th/cu cm is required to fit the measured ratios. The varying excitation temperatures of the satellites suggest that the LTE assumption is unrealistic and therefore the cause of the hyperfine anomalies.

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