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Article: Molecular shells in IRC+10216: Evidence for nonisotropic and episodic mass-loss enhancement

TitleMolecular shells in IRC+10216: Evidence for nonisotropic and episodic mass-loss enhancement
Authors
KeywordsCircumstellar Matter
Ism: Molecules
Stars: Agb And Post-Agb
Stars: Individual (Irc+10216)
Stars: Mass Loss
Issue Date2008
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2008, v. 678 n. 1, p. 303-308 How to Cite?
AbstractWe report high angular resolution VLA observations of cyanopolyyne molecules HC3N and HC5N from the carbon rich circumstellar envelope of IRC+10216. The observed low-lying rotational transitions trace a much more extended emitting region than seen in previous observations at higher frequency transitions. We resolve the hollow quasi-spherical distribution of the molecular emissions into a number of clumpy shells. These molecular shells coincide spatially with dust arcs seen in deep optical images of the IRC+10216 envelope, allowing us to study for the first time the kinematics of these features. We find that the molecular and dust shells represent the same density enhancements in the envelope separated in time by ∼120 to ∼360 yr. From the angular size and velocity spread of the shells, we estimate that each shell typically covers about 10% of the stellar surface at the time of ejection. The distribution of the shells seems to be random in space. The good spatial correspondence between HC3N and HC5N emissions is in qualitative agreement with a recent chemical model that takes into account the presence of density-enhanced shells. The broad spatial distribution of the cyanopolyyne molecules, however, would necessitate further study on their formation. © 2008. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/175131
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369

 

DC FieldValueLanguage
dc.contributor.authorDinhVTrungen_US
dc.contributor.authorLim, Jen_US
dc.date.accessioned2012-11-26T08:49:21Z-
dc.date.available2012-11-26T08:49:21Z-
dc.date.issued2008en_US
dc.identifier.citationAstrophysical Journal Letters, 2008, v. 678 n. 1, p. 303-308en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/175131-
dc.description.abstractWe report high angular resolution VLA observations of cyanopolyyne molecules HC3N and HC5N from the carbon rich circumstellar envelope of IRC+10216. The observed low-lying rotational transitions trace a much more extended emitting region than seen in previous observations at higher frequency transitions. We resolve the hollow quasi-spherical distribution of the molecular emissions into a number of clumpy shells. These molecular shells coincide spatially with dust arcs seen in deep optical images of the IRC+10216 envelope, allowing us to study for the first time the kinematics of these features. We find that the molecular and dust shells represent the same density enhancements in the envelope separated in time by ∼120 to ∼360 yr. From the angular size and velocity spread of the shells, we estimate that each shell typically covers about 10% of the stellar surface at the time of ejection. The distribution of the shells seems to be random in space. The good spatial correspondence between HC3N and HC5N emissions is in qualitative agreement with a recent chemical model that takes into account the presence of density-enhanced shells. The broad spatial distribution of the cyanopolyyne molecules, however, would necessitate further study on their formation. © 2008. The American Astronomical Society. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectCircumstellar Matteren_US
dc.subjectIsm: Moleculesen_US
dc.subjectStars: Agb And Post-Agben_US
dc.subjectStars: Individual (Irc+10216)en_US
dc.subjectStars: Mass Lossen_US
dc.titleMolecular shells in IRC+10216: Evidence for nonisotropic and episodic mass-loss enhancementen_US
dc.typeArticleen_US
dc.identifier.emailLim, J: jjlim@hku.hken_US
dc.identifier.authorityLim, J=rp00745en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1086/527669en_US
dc.identifier.scopuseid_2-s2.0-43949109892en_US
dc.identifier.volume678en_US
dc.identifier.issue1en_US
dc.identifier.spage303en_US
dc.identifier.epage308en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridDinhVTrung=6701469660en_US
dc.identifier.scopusauthoridLim, J=7403453870en_US

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