Observations of 13.5 micron rotation-vibration lines of SiS in IRC +10216

Details Observations of 13.5 micron rotation-vibration lines of SiS in IRC +10216 Observations of 13.5 micron rotation-vibration lines of SiS in IRC +10216

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420..863b&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 2, p. 863-868

Astronomy and Astrophysics

Astrophysics

23

Carbon Stars, Stellar Envelopes, Stellar Models, Variable Stars, Abundance, Fourier Transformation, Line Spectra, Temperature Distribution

Scientific paper

We report the first observations of the 13.5 micron fundamental band of SiS in the spectrum of the heavily obscured carbon star IRC +10216. The lines are formed in the inner region of the circumstellar envelope where the gas is accelerating and where the temperature ranges from 800-500 K. We have carried out a detailed model of the observed line profiles. Our observations are best fit by a gradient in the abundance of SiS. We derive an abundance relative to molecular hydrogen of x(SiS) = 4.3 x 10-6 at a distance of twelve stellar radii from the central star rising to x(SiS) = 4.3 x 10-5 at a few stellar radii from the surface of the star.

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