| dc.creator |
Tenenbaum, E. D. |
|
| dc.creator |
Apponi, A. J. |
|
| dc.creator |
Ziurys, L. M. |
|
| dc.creator |
Agúndez, Marcelino |
|
| dc.creator |
Cernicharo, José |
|
| dc.creator |
Pardo Carrión, Juan Ramón |
|
| dc.creator |
Guélin, Michel |
|
| dc.date |
2007-12-28T15:26:21Z |
|
| dc.date |
2007-12-28T15:26:21Z |
|
| dc.date |
2006-09-20 |
|
| dc.date.accessioned |
2017-01-31T00:59:35Z |
|
| dc.date.available |
2017-01-31T00:59:35Z |
|
| dc.identifier |
The Astrophysical Journal, 649: L17–L20 (2006) |
|
| dc.identifier |
1538-4357 |
|
| dc.identifier |
http://hdl.handle.net/10261/2641 |
|
| dc.identifier |
10.1086/508166 |
|
| dc.identifier.uri |
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2641 |
|
| dc.description |
The oxygen-bearing species C3O has been identified in the circumstellar envelope of the carbon star IRC +10216. The J = 8-->7, 9-->8, 10-->9, 14-->13, and 15-->14 transitions were detected at 2 and 3 mm using the Arizona Radio Observatory’s 12 m telescope. Measurements of the J = 9-->8, 10-->9, and 12-->11 lines were simultaneously conducted at the IRAM 30 m telescope. The line profiles of C3O are roughly U-shaped, indicating an extended shell distribution for this molecule in IRC +10216. The total column density derived for C3O is 1.2x10^12 cm^-2, at least an order of magnitude higher than that predicted by current chemical models. However, a revised model that includes reactions of atomic oxygen with carbon-chain radicals, such as l-C3H and C4, can reproduce the observed abundance. This model also predicts that C3O arises from a shell source with an outer radius near
r ∼ 30", consistent with the observations. These results suggest that gas phase neutral-neutral chemistry may be
producing the oxygen-bearing molecules present in the outer envelope of IRC +10216. |
|
| dc.description |
This material is based on work supported by the National Aeronautics and Space Administration through the NASA Astrobiology
Institute under Cooperative Agreement CAN-02-OSS-02 issued through the Office of Space Science. We also acknowledge support from Spanish MEC under project AYA2003-2785 and from "Comunidad de Madrid" under
PRICIT project S-0505/ESP-0237 (ASTROCAM). E. D. T. thanks NSF for a graduate research fellowship, and M. A. acknowledges Spanish MEC for a predoctoral grant AP2003-4619. |
|
| dc.description |
Peer reviewed |
|
| dc.format |
730379 bytes |
|
| dc.format |
application/pdf |
|
| dc.language |
eng |
|
| dc.publisher |
American Astronomical Society |
|
| dc.publisher |
University of Chicago Press |
|
| dc.rights |
openAccess |
|
| dc.subject |
Astrochemistry |
|
| dc.subject |
Circumstellar matter |
|
| dc.subject |
ISM: molecules |
|
| dc.subject |
Radio lines: stars |
|
| dc.subject |
Stars: carbon |
|
| dc.subject |
Stars: individual (IRC +10216) |
|
| dc.title |
Detection of C3O in IRC+10216: Oxygen-Carbon chain chemistry in the outer envelope |
|
| dc.type |
Artículo |
|