Excitation of HCN hyperfine lines in circumstellar envelopes - Redshift and molecular abundance

Details Excitation of HCN hyperfine lines in circumstellar envelopes - Redshift and molecular abundance Excitation of HCN hyperfine lines in circumstellar envelopes - Redshift and molecular abundance

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...214..267t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 214, no. 1-2, April 1989, p. 267-273.

Astronomy and Astrophysics

Astrophysics

17

Hydrocyanic Acid, Hyperfine Structure, Molecular Absorption, Red Shift, Stellar Envelopes, Line Spectra, Radiative Transfer, Stellar Mass Ejection

Scientific paper

The excitation of HCN in the circumstellar envelopes of evolved stars is investigated. The multilevel radiative transfer calculations account for the hyperfine structure as well as the nonlocal radiative interaction between different layers through line overlap and absorption of hyperfine components inside the expanding shell. It is found that radiation is more efficient than collision in the HCN excitation which is strongly enhanced by the line overlap.

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