Nimesh A. Patel et al. 2009 ApJ 692 1205 doi:10.1088/0004-637X/692/2/1205
Nimesh A. Patel1, Ken H. Young1, Sandra Brünken1, Robert W. Wilson1, Patrick Thaddeus1, Karl M. Menten2, Mark Reid1, Michael C. McCarthy1, Dinh-V-Trung3,4, Carl A. Gottlieb1 and Abigail Hedden1
Show affiliationsA 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 Si34S and 29SiS 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.
circumstellar matter; radio lines: stars; stars: individual (IRC+10216); stars: late-type; submillimeter
Issue 2 (2009 February 20)
Received 2008 September 3, accepted for publication 2008 November 14
Published 2009 February 23
Nimesh A. Patel et al. 2009 ApJ 692 1205
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