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Understanding the Chemical Complexity in Circumstellar Envelopes of C-rich AGB Stars: the Case of IRC +10216

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dc.creator Agúndez, Marcelino
dc.creator Cernicharo, José
dc.creator Pardo Carrión, Juan Ramón
dc.creator Fonfría, José Pablo
dc.creator Guélin, Michel
dc.creator Tenenbaum, E. D.
dc.creator Ziurys, L. M.
dc.creator Apponi, A. J.
dc.date 2007-12-27T16:18:10Z
dc.date 2007-12-27T16:18:10Z
dc.date 2007-03-28
dc.date.accessioned 2017-01-31T00:59:33Z
dc.date.available 2017-01-31T00:59:33Z
dc.identifier arXiv:astro-ph/0702491v2
dc.identifier Astrophysics and Space Science (2007)
dc.identifier 1572-946X
dc.identifier http://hdl.handle.net/10261/2621
dc.identifier 10.1007/s10509-007-9495-7
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2621
dc.description To appear in Astrophysics and Space Science, special issue of "Science with ALMA: a new era for Astrophysics" conference, November, 13-17 2006, ed. R. Bachiller
dc.description The circumstellar envelopes of carbon-rich AGB stars show a chemical complexity that is exemplified by the prototypical object IRC +10216, in which about 60 different molecules have been detected to date. Most of these species are carbon chains of the type CnH, CnH2, CnN, HCnN. We present the detection of new species (CH2CHCN, CH2CN, H2CS, CH3CCH and C3O) achieved thanks to the systematic observation of the full 3 mm window with the IRAM 30m telescope plus some ARO 12m observations. All these species, known to exist in the interstellar medium, are detected for the first time in a circumstellar envelope around an AGB star. These five molecules are most likely formed in the outer expanding envelope rather than in the stellar photosphere. A pure gas phase chemical model of the circumstellar envelope is reasonably successful in explaining the derived abundances, and additionally allows to elucidate the chemical formation routes and to predict the spatial distribution of the detected species.
dc.description MA acknowledges a grant from Spanish MEC: AP2003-4619.
dc.description Peer reviewed
dc.format 286331 bytes
dc.format application/pdf
dc.language eng
dc.publisher Springer
dc.relation Preprint
dc.rights openAccess
dc.subject Astrochemistry
dc.subject Circumstellar matter
dc.subject Molecular processes
dc.subject AGB stars
dc.subject IRC +10216
dc.title Understanding the Chemical Complexity in Circumstellar Envelopes of C-rich AGB Stars: the Case of IRC +10216
dc.type Pre-print


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