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dc.contributor.author
Fonfria, J. P.
dc.contributor.author
Fernandez Lopez, Manuel
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dc.contributor.author
Agúndez, M.
dc.contributor.author
Sanchez Contreras, C.
dc.contributor.author
Curiel, S
dc.contributor.author
Cernicharo, J.
dc.date.available
2016-08-11T16:09:33Z
dc.date.issued
2014-12
dc.identifier.citation
Fonfria, J. P.; Fernandez Lopez, Manuel; Agúndez, M.; Sanchez Contreras, C.; Curiel, S; et al.; The complex dust formation zone of the AGB star IRC+10216 probed with CARMA 0.25 arcsec angular resolution molecular observations; Wiley; Monthly Notices of the Royal Astronomical Society; 445; 3; 12-2014; 3289–3308
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/7097
dc.description.abstract
We present low spectral resolution molecular interferometric observations at 1.2 mm obtained with the Combined Array for Research in Millimetre-wave Astronomy (CARMA) towards the C-rich AGB star IRC+10216. We have mapped the emission of several lines of SiS, H13CN, SiO and SiC2 in the ground and first excited vibrational states with a high angular resolution of 0.25 arcsec. These observations have allowed us to partially resolve the emission of the envelope at distances from the star 50 stellar radii (R), where the stellar wind is mainly accelerated. The structure of the molecular emission has been modelled with a 3D radiation transfer code. The emission of line SiS (v = 0, J = 14–13) is best reproduced with a set of
maser emitting arcs arranged between 5 and 20R. The abundance of H13CN with respect to H2 decreases from 8 × 10−7 at 1–5R to 3 × 10−7 at 20R. The SiO observations are explained with an abundance 2 × 10−8 in the shell-like region between 1 and 5R. At this point, the SiO abundance sharply increases up to (2–3) × 10−7. The vibrational temperature of SiO increases by a factor of 2 due north-east between 20 and 50R. SiC2 is formed at the stellar surface with an abundance of 8 × 10−7 decreasing down to 8 × 10−8 at 20R probably due to depletion on to dust grains. Several asymmetries are found in the abundance distributions of H13CN, SiO and SiC2 which define three remarkable directions (north-east, south-southwest, and south-east) in the explored region of the envelope. There are some differences between the redshifted and blueshifted emissions of these molecules suggesting the existence of additional asymmetries in their abundance distributions along the line of sight.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Masers
dc.subject
Stars Abundances
dc.subject
Agb
dc.subject
Circumstellar Matter
dc.subject
Irc+10216 (Estrella)
dc.subject
Interferometric Techniques
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
The complex dust formation zone of the AGB star IRC+10216 probed with CARMA 0.25 arcsec angular resolution molecular observations
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-07-26T15:12:36Z
dc.journal.volume
445
dc.journal.number
3
dc.journal.pagination
3289–3308
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.conicet.avisoEditorial
This article has been accepted for publication in MNRAS © C 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
dc.description.fil
Fil: Fonfria, J. P.. Universidad Nacional Autonoma de Mexico. Instituto de Astronomia; México
dc.description.fil
Fil: Fernandez Lopez, Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto Argentino de Radioastronomia (i); Argentina
dc.description.fil
Fil: Agúndez, M.. Centro de Astrobiología. Departamento de Astrofísica. Laboratorio de Astrofísica Molecular; España
dc.description.fil
Fil: Sanchez Contreras, C.. Centro de Astrobiología. Departamento de Astrofísica. Laboratorio de Astrofísica Molecular; España
dc.description.fil
Fil: Curiel, S. Universidad Nacional Autonoma de Mexico. Instituto de Astronomia; México
dc.description.fil
Fil: Cernicharo, J.. Centro de Astrobiología. Departamento de Astrofísica. Laboratorio de Astrofísica Molecular; España
dc.journal.title
Monthly Notices of the Royal Astronomical Society
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stu1968
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://mnras.oxfordjournals.org/content/445/3/3289
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stu1968
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