Silicates as Probes of the Mass Loss History of Oxygen-Rich Evolved Stars

Details Silicates as Probes of the Mass Loss History of Oxygen-Rich Evolved Stars Silicates as Probes of the Mass Loss History of Oxygen-Rich Evolved Stars

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aspc..196...15k&link_type=abstract

Thermal Emission Spectroscopy and Analysis of Dust, Disks, and Regoliths, Proceedings of a meeting held at at The Lunar and Plan

Astronomy and Astrophysics

Astronomy

Scientific paper

Combined LWS and SWS observations (2.4 - 197 μm), obtained with the Infrared Space Observatory (ISO), provide a good coverage of the spectral energy distribution (SED) of the circumstellar dust shells of oxygen-rich evolved stars. The spectra of our sample of oxygen-rich stars with mass loss rates ranging from 10-7 - 10-4 Modot yr-1 exhibit a wealth of crystalline and amorphous silicate features. For increasing mass loss rates, we find that the crystalline silicate features become more pronounced. In two objects we find the presence of crystalline silicates in emission and amorphous silicates in absorption at the same wavelength, indicating a difference in spatial distribution of the two species; spherically symmetric and an axi-symmetric geometries are examined.

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