Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apjs...49..487r&link_type=abstract
Astrophysical Journal Supplement Series, vol. 49, Aug. 1982, p. 487-513. Research supported by the Universita di Venezia.
Astronomy and Astrophysics
Astrophysics
53
Acetylene, Carbon Stars, Near Infrared Radiation, Spectral Bands, Stellar Atmospheres, Stellar Spectra, Fourier Transformation, High Temperature, Line Spectra, Room Temperature, Spectral Resolution, Stellar Envelopes, Vibrational Spectra
Scientific paper
Acetylene (C2 H2) has been identified as a constituent of the atmospheres of cool carbon stars based on Fourier transform stellar spectra in the near-infrared. To interpret these astrophysical data on a quantitative basis, a systematic laboratory study of the absorption spectrum of acetylene occurring in this spectral region has been made at a resolution of ∼0.03 cm-1, both at room temperature and at an elevated temperature of 160° C. Interpretation of the acetylene lines in the 3 μm region has led to the identification of 27 vibration-rotation bands which have been assigned to transitions between 41 different vibrational states of 12C2H2 and 12C13 CH2/SUB and absolute strengths were measured for 101 selected unblended spectral lines distributed among some of the stronger bands including the 001000000 band of 12C13CH2. In addition, the integrated strengths of the Q-branches of the 1000011-0000000 band at 4091 cm-1 and the 0100011-0000000 band at 2701 cm-1 of 12C2H2 were measured, and by comparing with the stellar data for IRC+ 10216, an estimate has been made for the acetylene column density in the circumstellar shell of this carbon star.
Baldacci Agostino
Kameswara Rao N.
Rinsland Curtis P.
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