Spectroscopy of Crystalline Silicates in the SMC

Details Spectroscopy of Crystalline Silicates in the SMC Spectroscopy of Crystalline Silicates in the SMC

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30355h&link_type=abstract

Spitzer Proposal ID #30355

Astronomy and Astrophysics

Astronomy

Scientific paper

We propose IRS observations of four evolved stars in the Small Magellanic Cloud with infrared colors indicating the presence of crystalline silicate dust grains in their spectra. Spectra produced by crystalline silicates make it possible to study the astromineralogy of dust grains, specifically compositional details like olivine/pyroxene ratio and Mg/Fe ratio and the size and shape distribution. By observing the SMC, with its metal-poor nature compared to the Milky Way and even the LMC, we can examine how metallicity affects the formation and composition of circumstellar dust grains. This 1.3 hour program will observe four sources, adding to the small sample of three SMC sources known to have crystalline silicates in their spectra and improving our ability to intercompare samples from the two Magellanic Clouds and the Galaxy. These comparisons will help us understand how grain properties vary with metallicity.

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