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Article: Spitzer Space Telescope spectra of post-AGB stars in the large magellanic Cloud-polycyclic aromatic hydrocarbons at low metallicities

TitleSpitzer Space Telescope spectra of post-AGB stars in the large magellanic Cloud-polycyclic aromatic hydrocarbons at low metallicities
Authors
KeywordsStars
AGB and post-AGB
Circumstellar matter
Galaxies
Individual
Infrared
Large magellanic cloud
Issue Date2014
Citation
Monthly Notices of the Royal Astronomical Society, 2014, v. 439, n. 2, p. 1472-1493 How to Cite?
AbstractThis paper reports variations of polycyclic aromatic hydrocarbons (PAHs) features that were found in Spitzer Space Telescope spectra of carbon-rich post-asymptotic giant branch (post-AGB) stars in the Large Magellanic Cloud (LMC). The paper consists of two parts. The first part describes our Spitzer spectral observing programme of 24 stars including post-AGB candidates. The latter half of this paper presents the analysis of PAH features in 20 carbon-rich post-AGB stars in the LMC, assembled from the Spitzer archive as well as from our own programme.We found that five post-AGB stars showed a broad feature with a peak at 7.7 μm, that had not been classified before. Further, the 10-13 μm PAH spectra were classified into four classes, one of which has three broad peaks at 11.3, 12.3 and 13.3 μm rather than two distinct sharp peaks at 11.3 and 12.7 μm, as commonly found in HII regions. Our studies suggest that PAHs are gradually processed while the central stars evolve from post-AGB phase to planetary nebulae, changing their composition before PAHs are incorporated into the interstellar medium. Although some metallicity dependence of PAH spectra exists, the evolutionary state of an object is more significant than its metallicity in determining the spectral characteristics of PAHs for LMC and Galactic post-AGB stars. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Persistent Identifierhttp://hdl.handle.net/10722/209028
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806

 

DC FieldValueLanguage
dc.contributor.authorMatsuura, Mikako-
dc.contributor.authorBernard-Salas, Jeronimo-
dc.contributor.authorEvans, Tom Lloyd-
dc.contributor.authorVolk, Kevin M.-
dc.contributor.authorHrivnak, Bruce J.-
dc.contributor.authorSloan, Gregory C.-
dc.contributor.authorChu, Youhua-
dc.contributor.authorGruendl, Robert A.-
dc.contributor.authorKraemer, Kathleen E.-
dc.contributor.authorPeeters, Els-
dc.contributor.authorSzczerba, Ryszard E.-
dc.contributor.authorWood, Peter R.-
dc.contributor.authorZijlstra, Albert A.-
dc.contributor.authorHony, Sacha-
dc.contributor.authorIta, Yoshifusa-
dc.contributor.authorKamath, Devika-
dc.contributor.authorLagadec, Eric-
dc.contributor.authorParker, Quentin A.-
dc.contributor.authorReid, Warren A.-
dc.contributor.authorShimonishi, Takashi-
dc.contributor.authorWinckel, Hans Van-
dc.contributor.authorWoods, Paul M.-
dc.contributor.authorKemper, Francisca-
dc.contributor.authorMeixner, Margaret M.-
dc.contributor.authorOtsuka, Masaaki-
dc.contributor.authorSahai, Raghvendra-
dc.contributor.authorSargent, Benjamin A.-
dc.contributor.authorHora, Joseph L.-
dc.contributor.authorMcDonald, Iain-
dc.date.accessioned2015-03-23T02:31:12Z-
dc.date.available2015-03-23T02:31:12Z-
dc.date.issued2014-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2014, v. 439, n. 2, p. 1472-1493-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/209028-
dc.description.abstractThis paper reports variations of polycyclic aromatic hydrocarbons (PAHs) features that were found in Spitzer Space Telescope spectra of carbon-rich post-asymptotic giant branch (post-AGB) stars in the Large Magellanic Cloud (LMC). The paper consists of two parts. The first part describes our Spitzer spectral observing programme of 24 stars including post-AGB candidates. The latter half of this paper presents the analysis of PAH features in 20 carbon-rich post-AGB stars in the LMC, assembled from the Spitzer archive as well as from our own programme.We found that five post-AGB stars showed a broad feature with a peak at 7.7 μm, that had not been classified before. Further, the 10-13 μm PAH spectra were classified into four classes, one of which has three broad peaks at 11.3, 12.3 and 13.3 μm rather than two distinct sharp peaks at 11.3 and 12.7 μm, as commonly found in HII regions. Our studies suggest that PAHs are gradually processed while the central stars evolve from post-AGB phase to planetary nebulae, changing their composition before PAHs are incorporated into the interstellar medium. Although some metallicity dependence of PAH spectra exists, the evolutionary state of an object is more significant than its metallicity in determining the spectral characteristics of PAHs for LMC and Galactic post-AGB stars. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.-
dc.languageeng-
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society-
dc.subjectStars-
dc.subjectAGB and post-AGB-
dc.subjectCircumstellar matter-
dc.subjectGalaxies-
dc.subjectIndividual-
dc.subjectInfrared-
dc.subjectLarge magellanic cloud-
dc.titleSpitzer Space Telescope spectra of post-AGB stars in the large magellanic Cloud-polycyclic aromatic hydrocarbons at low metallicities-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1093/mnras/stt2495-
dc.identifier.scopuseid_2-s2.0-84897087849-
dc.identifier.volume439-
dc.identifier.issue2-
dc.identifier.spage1472-
dc.identifier.epage1493-
dc.identifier.eissn1365-2966-

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