Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21923803k&link_type=abstract
American Astronomical Society, AAS Meeting #219, #238.03
Astronomy and Astrophysics
Astrophysics
Scientific paper
Astronomical dust is observed in a variety of astrophysical environments and plays an important role in radiative processes and chemical evolution in the galaxy. Depending upon the environment, dust can be either carbon-rich or oxygen-rich (silicate grains). Astronomical observations and ground-based data show that the optical properties of silicates can change dramatically with the crystallinity of the material, and recent laboratory research provides evidence that the optical properties of silicate dust vary as a function of temperature as well. Therefore, correct interpretation of a vast array of astronomical data relies on the understanding of the properties of silicate dust as functions of wavelength, temperature, and crystallinity. The OPASI-T (Optical Properties of Astronomical Silicates with Infrared Techniques) project addresses the need for high quality optical characterization of metal-enriched silicate condensates using a variety of techniques. A combination of both new and established experiments are used to measure the extinction, reflection, and emission properties of amorphous silicates across the infrared, thus providing a comprehensive data set characterizing the optical parameters of dust samples. We present room temperature and cryogenic spectroscopic data, the various experimental apparatus and measurement techniques, and the computed optical constants for a sample of iron-silicate dust analogues.
Benford Dominic
Cataldo Giuseppe
Dwek Eli
Henry Richard
Kinzer Raymond
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