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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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