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Paper: An Interferometric Spectral Line Survey of IRC +10216 in the 345 GHz Band
Volume: 445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Page: 247
Authors: Patel, N. A.; Young, K. H.; Gottlieb, C. A.; Menten, K. M.
Abstract: We report a spectral-line survey of the extreme carbon star IRC +10216 carried out between 293.9 and 354.8 GHz with the Submillimeter Array. A total of 442 lines were detected, more than 200 for the first time; 145 are unassigned. Maps at an angular resolution of ∼3″ were btained for each line. A substantial new population of narrow lines with an expansion velocity of ∼ 4 km s-1 (i.e. ∼ 30% of the terminal velocity) was detected. Most of these lines are attributed to rotational transitions within vibrationally excited states, emitted from energy levels above the v=0, J=0 ground state with excitation energies of 1000–3000 K. Emission from these lines appears to be centered on the star with an angular extent of < 1″.
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