Abstract
view Abstract Citations (17) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ammonia in IRC +10216 : the inversion lines as a probe of envelope thermal structure. Kwok, S. ; Bell, M. B. ; Feldman, P. A. Abstract 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. Publication: The Astrophysical Journal Pub Date: July 1981 DOI: 10.1086/159017 Bibcode: 1981ApJ...247..125K Keywords: Ammonia; Carbon Stars; Stellar Envelopes; Stellar Mass Ejection; Stellar Spectra; Thermal Emission; Gas Temperature; Infrared Stars; Interstellar Gas; Late Stars; Line Spectra; Astrophysics full text sources ADS | data products SIMBAD (1)
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