Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...691l..55p&link_type=abstract
The Astrophysical Journal Letters, Volume 691, Issue 1, pp. L55-L58 (2009).
Astronomy and Astrophysics
Astronomy
5
Circumstellar Matter, Radio Lines: Stars, Stars: Individual: Irc+10216, Stars: Late-Type, Submillimeter
Scientific paper
Using the Submillimeter Array we have detected the J = 3-2 and 2-1 rotational transitions from within the first vibrationally excited state of CO toward the extreme carbon star IRC+10216 (CW Leo). The emission remains spatially unresolved with an angular resolution of ~2'' and, given that the lines originate from energy levels that are ~3100 K above the ground state, almost certainly originates from a much smaller (~1014 cm) sized region close to the stellar photosphere. Thermal excitation of the lines requires a gas density of ~109 cm-3, about an order of magnitude higher than the expected gas density based on previous infrared observations and models of the inner dust shell of IRC+10216.
Brunken Sandra
Menten Karl. M.
Patel Nimesh A.
Thaddeus Patrick
Wilson Robert W.
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