Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182l..15t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 1, Aug. 1987, p. L15-L18.
Astronomy and Astrophysics
Astrophysics
28
Carbon Stars, Molecular Excitation, Stellar Envelopes, Sulfides, Brightness Temperature, Comparison, Hydrocyanic Acid, Vibrational Spectra
Scientific paper
Vibrationally excited (v = 1) CS has been detected via its J = 2-1 and 5-4 transitions in the circumstellar shell IRC + 10216. Its properties are quite different from those of vibrationally excited SiO and HCN, the only other such species so far detected in IRC + 10216. In particular, the v = 1, J = 5-4 line shows strong self-absorption in the blue wind, to a degree not seen before in any IRC + 10216 profiles. Inhomogeneities in the envelope seem necessary to produce this effect, which cannot be explained by asymmetries inherent in appreciable line opacities. Negative results for CO v = 1 and CN v = 1 are consistent with current understanding of the IRC + 10216 envelope. Vibrationally excited HCN (0,2,0) is detected in Ori (KL), quantitatively confirming that vibrationally excited HCN in the hot core is excited solely by IR radiation from IRc2. The negative results for v = 1 CS, CO, and CN are analyzed in terms of this picture, and it is found that their hot core abundances are not greatly enhanced, unlike those of HCN, NH3, and H2O (which seem to be the products of grain disruption).
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