Submillimeter narrow emission lines from the inner envelope of IRC+10216
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, 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.
Keywords
Cite
@article{arxiv.0811.2142,
title = {Submillimeter narrow emission lines from the inner envelope of IRC+10216},
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},
journal= {arXiv preprint arXiv:0811.2142},
year = {2011}
}
Comments
5 pages, 5 figures, Accepted for publication in ApJ