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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 710131.0, MPI für Astronomie / Publikationen_mpia
Spitzer Space Telescope spectra of post-AGB stars in the Large Magellanic Cloud - polycyclic aromatic hydrocarbons at low metallicities
Authors:Matsuura, M.; Bernard-Salas, J.; Lloyd Evans, T.; Volk, K. M.; Hrivnak, B. J.; Sloan, G. C.; Chu, Y.-H.; Gruendl, R.; Kraemer, K. E.; Peeters, E.; Szczerba, R.; Wood, P. R.; Zijlstra, A. A.; Hony, S.; Ita, Y.; Kamath, D.; Lagadec, E.; Parker, Q. A.; Reid, W. A.; Shimonishi, T.; Van Winckel, H.; Woods, P. M.; Kemper, F.; Meixner, M.; Otsuka, M.; Sahai, R.; Sargent, B. A.; Hora, J. L.; McDonald, I.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Monthly Notices of the Royal Astronomical Society
Volume:439
Issue / Number:2
Start Page:1472
End Page:1493
Audience:Not Specified
Abstract / Description:This 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 mum, that had not been classified before. Further, the 10-13 mum PAH spectra were classified into four classes, one of which has three broad peaks at 11.3, 12.3 and 13.3 mum rather than two distinct sharp peaks at 11.3 and 12.7 mum, as commonly found in H II 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.
Free Keywords:stars: AGB and post-AGB; circumstellar matter; galaxies: individual: Large Magellanic Cloud; infrared: stars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stt2495
URL:http://cdsads.u-strasbg.fr/abs/2014MNRAS.439.1472M
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