Molecules and dust around oxygen-rich AGB stars

Details Molecules and dust around oxygen-rich AGB stars Molecules and dust around oxygen-rich AGB stars

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..209c&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

2

Stars: Agb And Post-Agb, Stars: Atmospheres, Circumstellar Matter, Stars: Late-Type, Infrared: Stars

Scientific paper

In this contribution, we present recent results from a study of the ISO/SWS spectra of a sample of O-rich AGB stars. Analysis of the molecular bands in the 2.3 - 8 μm region reveals an onion-like layering of the circumstellar matter in the extended atmosphere. The presence of an optically thick water layer for Mira variables is the most essential characteristic. We furthermore present an overview of the dust features observed in the 8 - 27 μm range of these spectra, tentatively identify one of the features with MgFeO and discuss the identification of other features with Al2O3 grains and spinel.

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