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Article: Circumstellar properties of S stars. I. Dust features

TitleCircumstellar properties of S stars. I. Dust features
Authors
KeywordsCircumstellar Matter
Dust, Extinction
Stars: Agb And Post-Agb
Issue Date1993
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X
Citation
The Astrophysical Journal, 1993, v. 416 n. 2, p. 769-786 How to Cite?
AbstractThe 1435 stars currently classified as of S spectral type have been searched for association with the IRAS Point Source Catalog. Among the 835 S stars with IRAS counterparts, 149 are found to have usable IRAS low-resolution spectra. The circumstellar properties of these S stars are classified using the LRS. We find that the circumstellar properties of S stars are very similar to those of M stars. For the S stars that have LRS, silicate emission objects form the largest group. Only four objects of the whole sample show the SiC emission feature commonly found in carbon stars. Some of the S stars that show a photospheric continuum with no infrared excess may not be thermal pulsing AGB stars but are mass transfer binaries. We propose a new classification scheme for AGB stars, taking into account both the photospheric and circumstellar spectral properties. This scheme recognizes the importance of mass loss on the evolution of AGB stars. The evolutionary status of S stars is discussed in terms of their circumstellar properties, and an evolutionary scenario is proposed to reconcile the visible photospheric properties and the circumstellar properties of S stars.
Persistent Identifierhttp://hdl.handle.net/10722/179680
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266

 

DC FieldValueLanguage
dc.contributor.authorChen, PSen_US
dc.contributor.authorKwok, Sen_US
dc.date.accessioned2012-12-19T10:02:48Z-
dc.date.available2012-12-19T10:02:48Z-
dc.date.issued1993en_US
dc.identifier.citationThe Astrophysical Journal, 1993, v. 416 n. 2, p. 769-786en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/179680-
dc.description.abstractThe 1435 stars currently classified as of S spectral type have been searched for association with the IRAS Point Source Catalog. Among the 835 S stars with IRAS counterparts, 149 are found to have usable IRAS low-resolution spectra. The circumstellar properties of these S stars are classified using the LRS. We find that the circumstellar properties of S stars are very similar to those of M stars. For the S stars that have LRS, silicate emission objects form the largest group. Only four objects of the whole sample show the SiC emission feature commonly found in carbon stars. Some of the S stars that show a photospheric continuum with no infrared excess may not be thermal pulsing AGB stars but are mass transfer binaries. We propose a new classification scheme for AGB stars, taking into account both the photospheric and circumstellar spectral properties. This scheme recognizes the importance of mass loss on the evolution of AGB stars. The evolutionary status of S stars is discussed in terms of their circumstellar properties, and an evolutionary scenario is proposed to reconcile the visible photospheric properties and the circumstellar properties of S stars.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637Xen_US
dc.relation.ispartofThe Astrophysical Journalen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectCircumstellar Matteren_US
dc.subjectDust, Extinctionen_US
dc.subjectStars: Agb And Post-Agben_US
dc.titleCircumstellar properties of S stars. I. Dust featuresen_US
dc.typeArticleen_US
dc.identifier.emailKwok, S: deannote@hku.hken_US
dc.identifier.authorityKwok, S=rp00716en_US
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1086/173276-
dc.identifier.scopuseid_2-s2.0-12044255580en_US
dc.identifier.volume416en_US
dc.identifier.issue2en_US
dc.identifier.spage769en_US
dc.identifier.epage786en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridChen, PS=7408354675en_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US

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