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

Abstract

view Abstract Citations (37) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of 13.5 Micron Rotation-Vibration Lines of SiS in IRC +10216 Boyle, R. J. ; Keady, J. J. ; Jennings, D. E. ; Hirsch, K. L. ; Wiedemann, G. R. Abstract 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. Publication: The Astrophysical Journal Pub Date: January 1994 DOI: 10.1086/173609 Bibcode: 1994ApJ...420..863B Keywords: Carbon Stars; Stellar Envelopes; Stellar Models; Variable Stars; Abundance; Fourier Transformation; Line Spectra; Temperature Distribution; Astronomy; MOLECULAR PROCESSES; STARS: ABUNDANCES; STARS: CARBON; STARS: CIRCUMSTELLAR MATTER; STARS: INDIVIDUAL ALPHANUMERIC: IRC; 10420 full text sources ADS | data products SIMBAD (2)