@article{0004-637X-692-2-1205,
  author={Nimesh A. Patel and Ken H. Young and Sandra Brünken and Robert W. Wilson and Patrick Thaddeus and Karl M. Menten and Mark
Reid and Michael C. McCarthy and  Dinh-V-Trung and Carl A. Gottlieb and Abigail Hedden},
  title={Submillimeter Narrow Emission Lines from the Inner Envelope of IRC+10216},
  journal={The Astrophysical Journal},
  volume={692},
  number={2},
  pages={1205},
  url={http://stacks.iop.org/0004-637X/692/i=2/a=1205},
  year={2009},
  abstract={A spectral-line survey of IRC+10216 in the 345 GHz band has been undertaken with the Submillimeter Array. Although not yet completed, it has already yielded a fairly large sample of narrow molecular emission lines with line widths indicating expansion velocities of ~ 4 km s –1 , less than three times the well known value of the terminal expansion velocity (14.5 km s –1 ) of the outer envelope. Five of these narrow lines have now been identified as rotational transitions in vibrationally excited states of previously detected molecules: the v = 1, J = 17-16, and J = 19-18 lines of Si 34 S and 29 SiS and the v = 2, J = 7-6 line of CS. Maps of these lines show that the emission is confined to a region within ~ 60 AU of the star, indicating that the narrow-line emission is probing the region of dust formation where the stellar wind is still being accelerated.}
}