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Article: Four newly identified sources with 21 micron emission

TitleFour newly identified sources with 21 micron emission
Authors
KeywordsCircumstellar Matter
Infrared: Stars
Planetary Nebulae: General
Stars: Carbon
Issue Date1995
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X
Citation
The Astrophysical Journal, 1995, v. 454 n. 1, p. 394-403 How to Cite?
AbstractMid-infrared spectroscopy and near- and mid-infrared photometry have been obtained for four carbon-rich cool IRAS sources whose IRAS low-resolution spectra are similar to those of proto-planetary nebulae (PPNs) possessing the unusual 21 μm emission feature. The 21 μm feature is detected in all four sources, nearly doubling the number of known 21 μm emitters. The energy distributions of these objects show the characteristic "double-peaked" structure, confirming that they are PPNs. Broad features near 7.7 and 11.3 μm similar to the unidentified infrared features (UIRs) seen in carbon-rich planetary nebulae (PNs) are also detected, suggesting a chemical link between these PPNs and PNs. The presence of the 21 μm eature appears to be correlated with the presence of unusually strong 3.4-3.5 μm features. Possible scenarios for the evolution of these emission features in the PPN phase are discussed.
Persistent Identifierhttp://hdl.handle.net/10722/179675
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266

 

DC FieldValueLanguage
dc.contributor.authorKwok, Sen_US
dc.contributor.authorHrivnak, BJen_US
dc.contributor.authorGeballe, TRen_US
dc.date.accessioned2012-12-19T10:02:45Z-
dc.date.available2012-12-19T10:02:45Z-
dc.date.issued1995en_US
dc.identifier.citationThe Astrophysical Journal, 1995, v. 454 n. 1, p. 394-403en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/179675-
dc.description.abstractMid-infrared spectroscopy and near- and mid-infrared photometry have been obtained for four carbon-rich cool IRAS sources whose IRAS low-resolution spectra are similar to those of proto-planetary nebulae (PPNs) possessing the unusual 21 μm emission feature. The 21 μm feature is detected in all four sources, nearly doubling the number of known 21 μm emitters. The energy distributions of these objects show the characteristic "double-peaked" structure, confirming that they are PPNs. Broad features near 7.7 and 11.3 μm similar to the unidentified infrared features (UIRs) seen in carbon-rich planetary nebulae (PNs) are also detected, suggesting a chemical link between these PPNs and PNs. The presence of the 21 μm eature appears to be correlated with the presence of unusually strong 3.4-3.5 μm features. Possible scenarios for the evolution of these emission features in the PPN phase are discussed.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.subjectInfrared: Starsen_US
dc.subjectPlanetary Nebulae: Generalen_US
dc.subjectStars: Carbonen_US
dc.titleFour newly identified sources with 21 micron emissionen_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.doi10.1086/176490-
dc.identifier.scopuseid_2-s2.0-11944251645en_US
dc.identifier.volume454en_US
dc.identifier.issue1en_US
dc.identifier.spage394en_US
dc.identifier.epage403en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US
dc.identifier.scopusauthoridHrivnak, BJ=35613962100en_US
dc.identifier.scopusauthoridGeballe, TR=7103289480en_US

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