Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-14
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures. Published in the Proceedings of the "I Workshop of Astronomy and Astrophysics for Students", Eds. N.R. Nap
Scientific paper
Laboratory characterization of Interplanetary Dust Particles (IDPs) collected in the lower stratosphere represents a concrete analysis of cosmic dust properties which played a fundamental role in the origin and evolution of Solar System. The IDPs were characterized by Field Emission Scanning Electron Microscope (FESEM) analyses and by InfraRed (IR) micro-spectroscopy. We present the FESEM images of six IDPs: three smooth grains, two porous and one a compact sphere. We also show the results of micro-IR transmission measurements on four IDPs that allowed us to identify their spectral class according to the criteria defined by Sandford and Walker. Only three of the analyzed particles show IR transmission spectra with a dominant "silicate absorption feature" so that they could be assigned to the three IR spectral classes: one has been classified as "amorphous olivine", one appears to be a mixture of "olivines" and "pyroxenes" and one belongs to the "layer-lattice silicates" spectral class.
Aronica A.
Colangeli Luigi
Ferrini Giulia
Palomba Ernesto
Rotundi Alessandra
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