Crystalline silicates: new probes of circumstellar dust conditions?

Details Crystalline silicates: new probes of circumstellar dust conditions? Crystalline silicates: new probes of circumstellar dust conditions?

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456..151m&link_type=abstract

ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP

Physics

Iso, Dust: Crystalline Silicates

Scientific paper

I discuss circumstellar dust around evolved stars, focusing on the recently discovered crystalline silicates. I show that the stars surrounded by dust with a high abundance of crystalline silicates are all sources which are known or expected to have a disk. I apply simple model fits to the spectra and find that the amorphous silicates are warmer than the crystalline silicates, which I attribute to a difference in Fe-content. The low temperature of crystalline silicates requires long-wavelength spectroscopy to detect them. I also find that enstatite is more abundant than forsterite. I discuss the use of the width and wavelength of the 69 μm feature, which is attributed to forsterite, as a temperature indicator.

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