Morphological effects on IR band profiles
Tamanai, Akemi Mutschke, Harald Blum, Jürgen Posch, Thomas Koike, Chiyoe Ferguson, Jason W.
Tamanai, Akemi
Mutschke, Harald
Blum, Jürgen
Posch, Thomas
Koike, Chiyoe
Ferguson, Jason W.
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2009-04-24
Type
Article
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Keywords
Infrared: Stars,Methods: Laboratory,Stars: Agb And Post-agb,Stars: Circumstellar Matter,Techniques: Spectroscopic,Infrared: Stars,Methods: Laboratory,Stars: Agb And Post-agb,Stars: Circumstellar Matter,Techniques: Spectroscopic,Agglomeration,Aluminum,Atmospheric Aerosols,Crystal Structure,Dust,Emission Spectroscopy,Leakage (fluid),Oxygen,Pelletizing,Special Effects,Titanium Dioxide,Titanium Oxides,Stars
Subjects (LCSH)
Citation
Morphological effects on IR band profiles - Experimental spectroscopic analysis with application to observed spectra of oxygen-rich AGB stars A. Tamanai, H. Mutschke, J. Blum, Th. Posch, C. Koike and J. W. Ferguson A&A, 501 1 (2009) 251-267 DOI: https://doi.org/10.1051/0004-6361/200911614
Abstract
Aims. To trace the source of the unique 13, 19.5, and 28 μm emission features in the spectra of oxygen-rich circumstellar shells around AGB stars, we have compared dust extinction spectra obtained by aerosol measurements. Methods. We have measured the extinction spectra for 19 oxide powder samples of eight different types, such as Ti-compounds (TiO, TiO<inf>2</inf>, Ti <inf>3</inf>O<inf>5</inf>, Ti<inf>3</inf>O<inf>5</inf>, Al<inf>2</inf>TiO <inf>5</inf>, CaTiO<inf>3</inf>), α-, γ-, ξ-δ-κ- Al<inf>2</inf>O<inf>3</inf>, and MgAl<inf>2</inf>O<inf>4</inf> in the infrared region (10-50 μm) paying special attention to the morphological (size, shape, and agglomeration) effects and the differences in crystal structure. Results. Anatase (TiO<inf>2</inf>) particles with rounded edges are the possible 13, 19.5 and 28 μm band carriers as the main contributor in the spectra of AGB stars, and spherically shaped nano-sized spinel and Al<inf>2</inf>TiO<inf>5</inf> dust grains are possibly associated with the anatase, enhancing the prominence of the 13 μm feature and providing additional features at 28 μm. The extinction data sets obtained by the aerosol and CsI pellet measurements have been made available for public use at http://elbe.astro.uni-jena.de. © 2009 ESO. © 2009 Elsevier B.V., All rights reserved.
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This is an open access article under the CC BY license.
Publisher
EDP Sciences
Journal
Astronomy and Astrophysics
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Archival Collection
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ISSN
0004-6361
1432-0746
1432-0746