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http://hdl.handle.net/10261/182993
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dc.contributor.author | Velilla Prieto, L. | - |
dc.contributor.author | Sánchez Contreras, C. | - |
dc.contributor.author | Cernicharo, José | - |
dc.contributor.author | Agúndez, Marcelino | - |
dc.contributor.author | Quintana-Lacaci, G. | - |
dc.contributor.author | Alcolea, Javier | - |
dc.contributor.author | Bujarrabal, V. | - |
dc.contributor.author | Herpin, F. | - |
dc.contributor.author | Menten, K. M. | - |
dc.contributor.author | Wyrowski, F. | - |
dc.date.accessioned | 2019-05-31T07:59:21Z | - |
dc.date.available | 2019-05-31T07:59:21Z | - |
dc.date.issued | 2015-03-02 | - |
dc.identifier | doi: 10.1051/0004-6361/201424768 | - |
dc.identifier | e-issn: 1432-0746 | - |
dc.identifier | issn: 0004-6361 | - |
dc.identifier.citation | Astronomy and Astrophysics 575: A84 (2015) | - |
dc.identifier.uri | http://hdl.handle.net/10261/182993 | - |
dc.description.abstract | Circumstellar envelopes (CSEs) around asymptotic giant branch (AGB) stars are the main sites of molecular formation. OH 231.8+4.2 is a well studied oxygen-rich CSE around an intermediate-mass evolved star that, in dramatic contrast to most AGB CSEs, displays bipolar molecular outflows accelerated up to ~400 km s-1. OH 231.8+4.2 also presents an exceptional molecular richness probably due to shock-induced chemical processes. We report the first detection in this source of four nitrogen-bearing species, HNCO, HNCS, HC3N, and NO, which have been observed with the IRAM-30 m radiotelescope in a sensitive mm-wavelength survey towards this target. HNCO and HNCS are also first detections in CSEs. The observed line profiles show that the emission arises in the massive (~0.6 M⊙) central component of the envelope, expanding with low velocities of Vexp~ 15–30 km s-1, and at the base of the fast lobes. The NO profiles (with FWHM~ 40–50 km s-1) are broader than those of HNCO, HNCS, and HC3N and, most importantly, broader than the line profiles of 13CO, which is a good mass tracer. This indicates that the NO abundance is enhanced in the fast lobes relative to the slow, central parts. From LTE and non-LTE excitation analysis, we estimate beam-average rotational temperatures of Trot~ 15–30 K (and, maybe, up to ~55 K for HC3N) and fractional abundances relative to H2 of X(HNCO) ~ [0.8–1] × 10-7, X(HNCS) ~ [0.9–1] × 10-8, X(HC3N) ~ [5–7] × 10-9, and X(NO) ~ [1–2] × 10-6. NO is, therefore, amongst the most abundant N-bearing species in OH 231.8+4.2. We performed thermodynamical chemical equilibrium and chemical kinetics models to investigate the formation of these N-bearing species in OH 231.8+4.2. The model underestimates the observed abundances for HNCO, HNCS, and HC3N by several orders of magnitude, which indicates that these molecules can hardly be products of standard UV-photon and/or cosmic-ray induced chemistry in OH 231.8+4.2 and that other processes (e.g. shocks) play a major role in their formation. For NO, the model abundance, ≈10-6, is compatible with the observed average value; however, the model fails to reproduce the NO abundance enhancement in the high-velocity lobes (relative to the slow core) inferred from the broad NO profiles. The new detections presented in this work corroborate the particularly rich chemistry of OH 231.8+4.2, which is likely to be profoundly influenced by shock-induced processes, as proposed in earlier works. | - |
dc.description.sponsorship | We acknowledge the Spanish MICINN/MINECO for funding support through grants AYA2009-07304, AYA2012-32032, and the ASTROMOL Consolider project CSD2009-00038. L.V. acknowledges the Spanish MINECO for funding support through FPI2012 short stay programme (ref. EEBB-I-13-06211) and the Laboratoire D’Astrophysique de Bordeaux (LAB-CNRS) for hosting this stay under the supervision of Dr. Marcelino Agúndez. L.V. also acknowledges the support of the Universidad Complutense de Madrid through the Ph.D. programme. M.A. acknowledges the support from the European Research Council (ERC Grant 209622: E3 ARTHS). | - |
dc.publisher | EDP Sciences | - |
dc.relation | info:eu-repo/grantAgreement/EC/FP7/209622 | - |
dc.rights | closedAccess | - |
dc.subject | Line: identification | - |
dc.subject | Astrochemistry | - |
dc.subject | Molecular processes | - |
dc.subject | Circumstellar matter | - |
dc.subject | Stars: AGB and post-AGB | - |
dc.title | New N-bearing species towards OH231.8+4.2 HNCO, HNCS, HC3N, and NO | - |
dc.type | artículo | - |
dc.identifier.doi | 10.1051/0004-6361/201424768 | - |
dc.relation.publisherversion | https://doi.org/10.1051/0004-6361/201424768 | - |
dc.date.updated | 2019-05-31T07:59:22Z | - |
dc.language.rfc3066 | eng | - |
dc.contributor.funder | Ministerio de Ciencia e Innovación (España) | - |
dc.contributor.funder | Ministerio de Economía y Competitividad (España) | - |
dc.contributor.funder | Universidad Complutense de Madrid | - |
dc.contributor.funder | European Research Council | - |
dc.relation.csic | Sí | - |
dc.identifier.funder | http://dx.doi.org/10.13039/501100003329 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100004837 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100000781 | es_ES |
dc.identifier.funder | http://dx.doi.org/10.13039/501100002911 | es_ES |
dc.type.coar | http://purl.org/coar/resource_type/c_6501 | es_ES |
item.fulltext | No Fulltext | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | none | - |
item.openairetype | artículo | - |
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