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Conference Paper: Molecular lines in the envelopes of evolved stars

TitleMolecular lines in the envelopes of evolved stars
Authors
KeywordsISM: molecules
Line: identification
Radio lines: ISM
Stars: AGB and post-AGB
Issue Date2008
PublisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=IAU
Citation
IAU Symp. #251, Organic Matter in Space, in press How to Cite?
AbstractWe report a spectral line survey of the circumstellar envelopes of evolved stars at millimeter wavelengths. The data allow us to investigate the chemical processes in different physical environments and evolutionary stages. A total of more than 500 emission features (mostly rotational transitions of molecules) are detected in the survey. Our observations show that the sources in different evolutionary stages have remarkably different chemical composition. As a star evolves from AGB stage to proto-planetary nebula, the abundances of Si-bearing molecules (SiO, SiCC, and SiS) decrease, while the abundances of some long-chain molecules, such as CH3CN, C4H, and HC3N, increase. After further evolution to planetary nebula, the abundances of neutral molecules dramatically decrease, and the emission from molecular ions becomes more intense. These differences can be attributed to the changes of the role that dust, stellar winds, shock waves, and UV/X-rays from the central star play in different evolutionary stages. These results will provide significant constraints on models of circumstellar chemistry. © 2008 International Astronomical Union.
Persistent Identifierhttp://hdl.handle.net/10722/109785
ISSN
2015 SCImago Journal Rankings: 0.105

 

DC FieldValueLanguage
dc.contributor.authorZhang, Yen_HK
dc.contributor.authorKwok, Sen_HK
dc.contributor.authorTrung, DVen_HK
dc.date.accessioned2010-09-26T01:37:10Z-
dc.date.available2010-09-26T01:37:10Z-
dc.date.issued2008en_HK
dc.identifier.citationIAU Symp. #251, Organic Matter in Space, in pressen_HK
dc.identifier.issn1743-9213en_HK
dc.identifier.urihttp://hdl.handle.net/10722/109785-
dc.description.abstractWe report a spectral line survey of the circumstellar envelopes of evolved stars at millimeter wavelengths. The data allow us to investigate the chemical processes in different physical environments and evolutionary stages. A total of more than 500 emission features (mostly rotational transitions of molecules) are detected in the survey. Our observations show that the sources in different evolutionary stages have remarkably different chemical composition. As a star evolves from AGB stage to proto-planetary nebula, the abundances of Si-bearing molecules (SiO, SiCC, and SiS) decrease, while the abundances of some long-chain molecules, such as CH3CN, C4H, and HC3N, increase. After further evolution to planetary nebula, the abundances of neutral molecules dramatically decrease, and the emission from molecular ions becomes more intense. These differences can be attributed to the changes of the role that dust, stellar winds, shock waves, and UV/X-rays from the central star play in different evolutionary stages. These results will provide significant constraints on models of circumstellar chemistry. © 2008 International Astronomical Union.en_HK
dc.languageengen_HK
dc.publisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=IAUen_HK
dc.relation.ispartofProceedings of the International Astronomical Unionen_HK
dc.subjectISM: moleculesen_HK
dc.subjectLine: identificationen_HK
dc.subjectRadio lines: ISMen_HK
dc.subjectStars: AGB and post-AGBen_HK
dc.titleMolecular lines in the envelopes of evolved starsen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailZhang, Y: zhangy96@hku.hken_HK
dc.identifier.emailKwok, S: deannote@hku.hken_HK
dc.identifier.authorityZhang, Y=rp00841en_HK
dc.identifier.authorityKwok, S=rp00716en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1017/S1743921308021480en_HK
dc.identifier.scopuseid_2-s2.0-53349089436en_HK
dc.identifier.hkuros143892en_HK
dc.identifier.volume4en_HK
dc.identifier.issueS251en_HK
dc.identifier.spage169en_HK
dc.identifier.epage170en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhang, Y=23768446500en_HK
dc.identifier.scopusauthoridKwok, S=22980498300en_HK
dc.identifier.scopusauthoridTrung, DV=6701469660en_HK

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