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• W2032852742 endingPage "2593" @default.
• W2032852742 startingPage "2577" @default.
• W2032852742 abstract "We searched the Spitzer Space Telescope data archive for Galactic planetary nebulae (PNe), that show the characteristic 17.4 and um features due to C60, also known as buckminsterfullerene. Out of 338 objects with Spitzer/IRS data, we found eleven C60-containing PNe, six of which (Hen2-68, IC2501, K3-62, M1-6, M1-9, and SaSt2-3) are new detections. We analyzed the spectra, along with ancillary data, using the photo-ionization code CLOUDY to establish the atomic line fluxes, and determine the properties of the radiation field, as set by the effective temperature of the central star. In addition, we measured the infrared spectral features due to dust grains. We find that the Polycyclic Aromatic Hydrocarbon (PAH) profile over 6-9 um in these C60-bearing carbon-rich PNe is of the more chemically-processed class A. The intensity ratio of 3.3 um to 11.3 um PAH indicates that the number of C-atoms per PAH in C60-containing PNe is small compared to that in non-C60 PNe. The Spitzer spectra also show broad dust features around 11 and 30 um. Analysis of the 30-um feature shows that it is strongly correlated with the continuum, and we propose that a single carbon-based carrier is responsible for both the continuum and the feature. The strength of the 11-um feature is correlated to the temperature of the dust, suggesting that it is at least partially due to a solid-state carrier. The chemical abundances of C60-containing PNe can be explained by AGB nucleosynthesis models for initially 1.5-2.5 Msun stars with Z=0.004. We plotted the locations of C60-containing PNe on a face-on map of the Milky Way and we found that most of these PNe are outside the solar circle, consistent with low metallicity values. Their metallicity suggests that the progenitors are an older population." @default.
• W2032852742 created "2016-06-24" @default.
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• W2032852742 date "2013-12-03" @default.
• W2032852742 modified "2023-10-17" @default.
• W2032852742 title "Physical properties of fullerene-containing Galactic planetary nebulae" @default.
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• W2032852742 doi "https://doi.org/10.1093/mnras/stt2070" @default.
• W2032852742 hasPublicationYear "2013" @default.
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