Journal Article

IRAS 22036+5306: an Al<sub>2</sub>O<sub>3</sub> oxide-dominated post-AGB star

M. M. Maldoni, T. R. Ireland and G. Robinson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 386, issue 4, pages 2290-2296
Published in print June 2008 | ISSN: 0035-8711
Published online April 2008 | e-ISSN: 1365-2966 | DOI:
IRAS 22036+5306: an Al2O3 oxide-dominated post-AGB star

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Radiative transfer modelling of the Infrared Space Observatory (ISO) spectrum of IRAS 22036+5306 has shown that its unusual 11-μm band can be suitably modelled with an alumina-olivine mixture substantially dominated by the former. The results of this work add further credence to recent findings that significant amounts of Al2O3 dust grains are present in the dust shells of stars near or beyond the tip of the asymptotic giant branch. Indeed, in the case of IRAS 22036+5306, Al2O3 dominates the dust composition to the extent that it shifts the 9.8-μm band due to amorphous silicates to 11 μm. IRAS 22036+5306 may be an unusual case in that the inner dust torus is maintained at a sufficiently high temperature for Al2O3 condensation, but not silicate.

Keywords: radiative transfer; stars: AGB and post-AGB; circumstellar matter; dust, extinction; infrared: stars

Journal Article.  6492 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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