| People | Locations | Statistics |
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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
Places of action
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document
Dust Formation in a Primitive Environment
Abstract
Observations suggest that Asymptotic Giant Branch (AGB) stars contribute significantly to the dust budgets of galaxies, from our own Presolar Nebula to the Magellanic Clouds. However, models suggest their contribution should decrease with metallicity, possibly becoming overshadowed by supernova and interstellar grain growth in primitive environments. Recent observations of nearby dwarf galaxies contradict this prediction, showing that AGB dust forms easily at low metallicity, which allows AGB stars to contribute dust as early as 30 Myr after they form in the early Universe. Because of limitations in sensitivity, absolutely nothing is known about the mineralogy, the grain properties, or the even the quantity of this extremely metal-poor dust. We propose observations of the nearby dwarf galaxy Sextans A, which is the Goldilocks galaxy for a comprehensive assessment of the effect of primitive abundances on dust formation because it 1) is nearby enough to escape crowding and sensitivity limits at the longest wavelengths, 2) is extremely metal-poor (just ~7% solar or 2.5x lower than the SMC), 3) is known to harbor a large AGB population that spans the full AGB mass range, 4) many of these AGB stars are known to be dusty, and 5) dust has been detected in its interstellar medium. No other galaxy comes close to providing the opportunities afforded by Sextans A. We will image the star-forming disk with NIRCam and MIRI from 0.9-25.5 microns, with careful filter selection to fully sample key molecular and dust features. We will also obtain LRS spectra of 6 known dusty stars to guide our interpretation of the photometry around the most prominent infrared features from 5-12 microns....