Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543106n&link_type=abstract
American Astronomical Society, AAS Meeting #215, #431.06; Bulletin of the American Astronomical Society, Vol. 42, p.363
Astronomy and Astrophysics
Astrophysics
Scientific paper
Many astrophysical environments exhibit a spectral feature at around 10 microns, which has long been attributed to amorphous silicates. However, the precise composition of almost ubiquitous silicate dust grains remains a mystery. Furthermore, the astronomically observed feature varies from location to location, and even within a given object both spatially and temporally.
There have been many laboratory studies of potential cosmic dust analogs attempting to determine the exact nature of this dust, but most of those studies have failed to produce laboratory spectra that precisely match the observed astronomical spectra. We present new high-resolution spectra of a selection of silicate glasses whose compositions cover (and go beyond) those expected to form in cosmic environments. We demonstrate the effects of both compositional and structural factors on spectral features in "amorphous” silicates. In particular, we determine the competing effects of Mg/Fe ratio and polymerizations (NBO/T) on the 10 micron spectral features. Finally, we compare our glass spectra with a selection of observed 10 micron features in AGB star spectra.
Hofmeister Anne
Newgard Arielle L.
Speck Angela
Tartar Josh
Whittington Alan
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