Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/2609
COMPARTIR / EXPORTAR:
logo share SHARE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE

Invitar a revisión por pares abierta
Campo DC Valor Lengua/Idioma
dc.contributor.authorAgúndez, Marcelino-
dc.contributor.authorFonfría, José Pablo-
dc.contributor.authorCernicharo, José-
dc.contributor.authorPardo Carrión, Juan Ramón-
dc.contributor.authorGuélin, Michel-
dc.date.accessioned2007-12-26T16:18:00Z-
dc.date.available2007-12-26T16:18:00Z-
dc.date.issued2007-12-06-
dc.identifier.citationarXiv:0712.1029v1en_US
dc.identifier.urihttp://hdl.handle.net/10261/2609-
dc.descriptionBased on observations carried out with the IRAM 30-meter telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).-- Accepted for publication in Astronomy & Astrophysics.en_US
dc.description.abstractWe report on the detection of vinyl cyanide (CH2CHCN), cyanomethyl radical (CH2CN), methylacetylene (CH3CCH) and thioformaldehyde (H2CS) in the C-rich star IRC +10216. These species, which are all known to exist in dark clouds, are detected for the first time in the circumstellar envelope around an AGB star. The four molecules have been detected trough pure rotational transitions in the course of a 3 mm line survey carried out with the IRAM 30-m telescope. The molecular column densities are derived by constructing rotational temperature diagrams. A detailed chemical model of the circumstellar envelope is used to analyze the formation of these molecular species. We have found column densities in the range 5 x 10^(12)- 2 x 10^(13) cm^(-2), which translates to abundances relative to H2 of several 10^(-9). The chemical model is reasonably successful in explaining the derived abundances through gas phase synthesis in the cold outer envelope. We also find that some of these molecules, CH2CHCN and CH2CN, are most probably excited trough infrared pumping to excited vibrational states. The detection of these species stresses the similarity between the molecular content of cold dark clouds and C-rich circumstellar envelopes. However, some differences in the chemistry are indicated by the fact that in IRC +10216 partially saturated carbon chains are present at a lower level than those which are highly unsaturated, while in TMC-1 both types of species have comparable abundances.en_US
dc.description.sponsorshipThis work has been supported by Spanish MEC through grants AYA2003-2785, ESP2004-665 and AYA2006-14876, by "Comunidad de Madrid" under PRICIT project S-0505/ESP-0237 (ASTROCAM) and by the European Community’s human potential Programme under contract MCRTNCT-2004-51230 (The Molecular Universe). MA also acknowledges funding support from Spanish MEC through grant AP2003-4619.en_US
dc.format.extent664869 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoengen_US
dc.relation.isversionofPreprint-
dc.rightsopenAccessen_US
dc.subjectAstrochemistryen_US
dc.subjectCircumstellar matteren_US
dc.subjectStars: Asymptotic Giant Branch (AGB) and post-AGBen_US
dc.subjectStars: carbonen_US
dc.subjectStars: Individual: IRC +102en_US
dc.titleDetection of circumstellar CH2CHCN, CH2CN, CH3CCH and H2CSen_US
dc.typepreprinten_US
dc.description.peerreviewedPeer revieweden_US
dc.type.coarhttp://purl.org/coar/resource_type/c_816bes_ES
item.openairetypepreprint-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_816b-
item.fulltextWith Fulltext-
Aparece en las colecciones: (CFMAC-IEM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato
Circumstellar.pdf649,29 kBAdobe PDFVista previa
Visualizar/Abrir
Show simple item record

CORE Recommender

Page view(s)

411
checked on 28-mar-2024

Download(s)

328
checked on 28-mar-2024

Google ScholarTM

Check


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.