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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Zijlstra, Albert
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2023The heart of Sakurai's Object revealed by ALMAcitations
- 2021Dust Formation in a Primitive Environment
- 2021Dust Formation in a Primitive Environment
- 2020The infrared view of dust and molecules around V4334 Sgr (Sakurai’s Object): a 20-year retrospectivecitations
- 2019Stellar Pulsation and the Production of Dust and Molecules in Galactic Carbon Starscitations
- 2016The Infrared Spectral Properties of Magellanic Carbon Starscitations
- 2016The Infrared Spectral Properties of Magellanic Carbon Starscitations
- 2014The Herschel planetary nebula survey (HerPlaNS): I. Data overview and analysis demonstration with NGC? 6781citations
- 2011The identification of probable SiS emission at 13-14 μm in spectra of galactic S starscitations
- 2009Unusual dust emission from planetary nebulae in the magellanic cloudscitations
- 2008The Magellanic zoo: Mid-infrared Spitzer spectroscopy of evolved stars and circumstellar dust in the Magellanic Cloudscitations
- 2007Luminosities and mass-loss rates of carbon stars in the Magellanic Cloudscitations
- 2007Molecules and dust grains in AGB stars in nearby galaxies - The influence of metallicities
- 2006A Spitzer mid-infrared spectral survey of mass-losing carbon stars in the Large Magellanic Cloudcitations
- 2005An empirical formula for the mass-loss rates of dust-enshrouded red supergiants and oxygen-rich Asymptotic Giant Branch starscitations
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article
The Herschel planetary nebula survey (HerPlaNS): I. Data overview and analysis demonstration with NGC? 6781
Abstract
Context. This is the first of a series of investigations into far-IR characteristics of 11 planetary nebulae (PNe) under the Herschel Space Observatory open time? 1 program, Herschel Planetary Nebula Survey (HerPlaNS). Aims. Using the HerPlaNS data set, we look into the PN energetics and variations of the physical conditions within the target nebulae. In the present work, we provide an overview of the survey, data acquisition and processing, and resulting data products. Methods. We performed (1) PACS/SPIRE broadband imaging to determine the spatial distribution of the cold dust component in the target PNe and (2) PACS/SPIRE spectral-energy-distribution and line spectroscopy to determine the spatial distribution of the gas component in the target PNe. Results. For the case of NGC? 6781, the broadband maps confirm the nearly pole-on barrel structure of the amorphous carbon-rich dust shell and the surrounding halo having temperatures of 26-40? K. The PACS/SPIRE multiposition spectra show spatial variations of far-IR lines that reflect the physical stratification of the nebula. We demonstrate that spatially resolved far-IR line diagnostics yield the (Te, ne) profiles, from which distributions of ionized, atomic, and molecular gases can be determined. Direct comparison of the dust and gas column mass maps constrained by the HerPlaNS data allows to construct an empirical gas-to-dust mass ratio map, which shows a range of ratios with the median of 195 ± 110. The present analysis yields estimates of the total mass of the shell to be 0.86? M?, consisting of 0.54? M? of ionized gas, 0.12? M? of atomic gas, 0.2? M? of molecular gas, and 4 × 10-3? M? of dust grains. These estimates also suggest that the central star of about 1.5? M? initial mass is terminating its PN evolution onto the white dwarf cooling track. Conclusions. The HerPlaNS data provide various diagnostics for both the dust and gas components in a spatially resolved manner. In the forthcoming papers of the HerPlaNS series we will explore the HerPlaNS data set fully for the entire sample of 11 PNe. © ESO 2014.