Features of oxide dust particles in circumstellar shells of AGB stars

Details Features of oxide dust particles in circumstellar shells of AGB stars Features of oxide dust particles in circumstellar shells of AGB stars

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511..141p&link_type=abstract

Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We give an overview of the dust emission features that oxide dust particles which are expected to form in circumstellar shells of AGB stars can produce. The dust species considered here are titanium oxides, Ca-Al-oxides, Mg-Al-oxides, Mg-Fe-oxides and amorphous alumina. At least for the presence of the latter three classes of solids, clear observational evidence exists. Some of those stars which form Mg-Al-oxide and Mg-Fe-oxide dust do not show any or do show very little amorphous silicate emission. This raises the question whether there exists a class of low-mass-loss dust shells dominated by oxides and not by silicates.

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