Submillimeter narrow emission lines from the inner envelope of IRC+10216

Details Submillimeter narrow emission lines from the inner envelope of IRC+10216 Submillimeter narrow emission lines from the inner envelope of IRC+10216

2008-11-13

arxiv.org/abs/0811.2142v1

Astrophys.J.692:1205-1210,2009

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures, Accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/692/2/1205

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, less than 3 times the well-known value of the terminal expansion velocity (14.5 km/s) 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.

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