Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183l..23t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. L23-L26.
Astronomy and Astrophysics
Astrophysics
37
Molecular Oscillations, Molecular Spectra, Radio Spectra, Silicon Compounds, Stellar Envelopes, Sulfides, Carbon, Emission Spectra, Spectral Line Width, Stellar Spectrophotometry
Scientific paper
Vibrationally excited (υ = 1) SiS has been detected via its J = 12-11, 13-12, and 14-13 transitions in the circumstellar shell IRC +10216. The unusually narrow linewidths indicate that the SiS υ = 1 emission arises in the innermost, accelerating zone of the envelope. Brightness temperatures are therefore ⪆600K, and are shown to be consistent with thermal excitation (via IR radiation) of the υ = 1 state, although maser activity is also possible. While the observed lack of υ = 1 emission from CO and SiO is shown to be consistent with current estimates of CO and SiO abundances, analysis of υ = 1 SiS and CS emission, which show contrasting characteristics, indicates that the SiS abundance must decrease significantly outside the inner 600K core, while the CS abundance must increase outside the inner core, even more sharply.
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