Query : 2009A&A...501..251T

2009A&A...501..251T - Astronomy and Astrophysics, volume 501, 251-267 (2009/7-1)

Morphological effects on IR band profiles. Experimental spectroscopic analysis with application to observed spectra of oxygen-rich AGB stars.


Abstract (from CDS):

To trace the source of the unique 13, 19.5, and 28µm emission features in the spectra of oxygen-rich circumstellar shells around AGB stars, we have compared dust extinction spectra obtained by aerosol measurements. We have measured the extinction spectra for 19 oxide powder samples of eight different types, such as Ti-compounds (TiO, TiO2, Ti2O3, Ti3O5, Al2TiO5, CaTiO3), α-, γ-, χ-δ-κ-Al2O3, and MgAl2O4 in the infrared region (10-50µm) paying special attention to the morphological (size, shape, and agglomeration) effects and the differences in crystal structure. Anatase (TiO2) 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 Al2TiO5 dust grains are possibly associated with the anatase, enhancing the prominence of the 13 µm feature and providing additional features at 28µm. The extinction data sets obtained by the aerosol and CsI pellet measurements have been made available for public use at url http://elbe.astro.uni-jena.de .

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: AGB and post-AGB - infrared: stars - methods: laboratory - techniques: spectroscopic

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 V* Y UMa AB* 12 40 21.2802395640 +55 50 47.599083060   9.66 7.70     M7II-III: 91 0
2 * g Her AB* 16 28 38.5495839988 +41 52 54.044914927 7.70 6.53 5.01 2.49 0.26 M6-III 378 0
3 V* S Pav Mi* 19 55 13.9680387696 -59 11 44.333160288   9.25 8.21     M8III 91 0
4 V* V1943 Sgr AB* 20 06 55.2441583872 -27 13 29.766501516   9.25 8.04     M7/8III 78 0

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