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Detection of circumstellar nitric oxide. Enhanced nitrogen abundance in IRC +10420

hal.structure.identifierInstituto de RadioAstronomía Milimétrica [IRAM]
dc.contributor.authorQUINTANA-LACACI, G.
hal.structure.identifierSSE 2013
dc.contributor.authorAGÚNDEZ, M.
hal.structure.identifierCentro de Astrobiologia [Madrid] [CAB]
dc.contributor.authorCERNICHARO, J.
dc.contributor.authorBUJARRABAL, V.
dc.contributor.authorSÁNCHEZ CONTRERAS, C.
dc.contributor.authorCASTRO-CARRIZO, A.
dc.contributor.authorALCOLEA, J.
dc.date.issued2013-12
dc.identifier.issn0004-6361
dc.description.abstractEnAims: During a full line survey towards IRC +10420 in the 3 and 1 mm bands, we detected the emission of circumstellar nitric oxide for the first time. We aim to study the formation of NO and to confirm the enrichment of nitrogen expected for the most massive, evolved stars predicted by the hot bottom burning process. Methods: We counted on a detailed model of the structure and kinematics of the molecular gas around IRC+˙10420. In addition, we used a chemical model to derive the NO abundance profile. We modified the initial nitrogen abundance in order to fit the observed NO profiles. These synthetic profiles were obtained using an LVG radiative transfer code. Results: We have detected NO in a circumstellar envelope for the first time, along with a variety of N-rich molecules, which in turn shows that IRC +10420 presents a N-rich chemistry. Furthermore, we have found that to reproduce the observed NO line profiles, the initial abundance of nitrogen in the chemical model has to be increased by a factor 20 with respect to the values of the standard O-rich stars. Based on observations carried out with the IRAM 30 m Telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).Figures 3 and 4 are available in electronic form at http://www.aanda.org
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.enastrochemistry
dc.subject.enline: identification
dc.subject.enmolecular processes
dc.subject.encircumstellar matter
dc.subject.ensupergiants
dc.subject.enstars: individual: IRC +10420
dc.title.enDetection of circumstellar nitric oxide. Enhanced nitrogen abundance in IRC +10420
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201322728
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageL2
bordeaux.volume560
bordeaux.peerReviewedoui
hal.identifierhal-01016722
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01016722v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2013-12&rft.volume=560&rft.spage=L2&rft.epage=L2&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=QUINTANA-LACACI,%20G.&AG%C3%9ANDEZ,%20M.&CERNICHARO,%20J.&BUJARRABAL,%20V.&S%C3%81NCHEZ%20CONTRERAS,%20C.&rft.genre=article


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