IRAS22036+5306: an Al2O3 oxide-dominated post-AGB star

Details IRAS22036+5306: an Al2O3 oxide-dominated post-AGB star IRAS22036+5306: an Al2O3 oxide-dominated post-AGB star

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.386.2290m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 386, Issue 4, pp. 2290-2296.

Astronomy and Astrophysics

Astronomy

3

Radiative Transfer, Stars: Agb And Post-Agb, Circumstellar Matter, Dust, Extinction, Infrared: Stars

Scientific paper

Radiative transfer modelling of the Infrared Space Observatory (ISO) spectrum of IRAS22036+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 IRAS22036+5306, Al2O3 dominates the dust composition to the extent that it shifts the 9.8-μm band due to amorphous silicates to 11μm. IRAS22036+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.

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