Morlok, A.; Bowey, J.E.; Kohler, M. and Grady, M.M.
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Infrared spectra of mineral grains from primitive meteorites could be useful for comparison with astronomical infrared spectra since some of their grains might be similar to those formed in the planet-forming disks around young stars or in the envelopes surrounding late-type stars. To assess the usefulness of meteorite spectra, olivine grains separated from primitive meteorites have been analyzed using FTIR microscope techniques in the 2-16 mu m wavelength range. The sub-micron sizes of the grains made a complex preparation process necessary.
Five characteristic bands were measured near 11.9, 11.2, 10.4, 10.1, and 10.0 mu m. The results of 59 analyses allow the calculation of band positions for meteoritic olivines as a function of their iron and magnesium contents. Comparison of the meteoritic results with astronomical data for comets and dust around young and old stars, which exhibit bands similar to the strongest infrared bands observed in the grains (at 11.2 mu m), show that the spectral resolution of the astronomical observations is too low to ascertain the exact iron and magnesium (Mg:Fe) ratio of the dust in the 8-13 mu m wavelength range.
|Item Type:||Journal Article|
|Keywords:||infrared-absorption spectra; carbonaceous chondrites; reflectance spectra; compositional dependence; crystalline silicates; interstellar grains; evolved stars; dust; mineralogy; fayalite|
|Academic Unit/Department:||Science > Physical Sciences
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Astrid Peterkin|
|Date Deposited:||27 Feb 2007|
|Last Modified:||15 Jan 2016 10:06|
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