Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..125k&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, July 1, 1981, p. 125-129.
Astronomy and Astrophysics
Astrophysics
13
Ammonia, Carbon Stars, Stellar Envelopes, Stellar Mass Ejection, Stellar Spectra, Thermal Emission, Gas Temperature, Infrared Stars, Interstellar Gas, Late Stars, Line Spectra
Scientific paper
The ammonia molecule is shown to be an effective probe of gas temperature in circumstellar envelopes of late-type stars. The inversion lines of ammonia, being narrowly separated in frequency but arising from states with widely different excitation requirements, are found to be capable of yielding the detailed thermal structure of circumstellar envelopes. Observations of IRC +10 deg 216 have been made with possible detections of the (1, 1) and (2, 2) lines. Calculations performed for this star show that the (1, 1) line is expected to be emitted over an extended region, whereas the (2, 2) state is excited only in the inner part of the envelope. The observational results are compared to the model.
Bell Moley B.
Feldman Paul A.
Kwok Sun
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