Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20146g&link_type=abstract
Spitzer Proposal ID #20146
Other
Scientific paper
We propose to observe a sample of hot, reddened stars and closely matched comparison stars in order to measure the wavelength dependence of the diffuse interstellar extinction curve from 3-38 micron as a function of environment. These observations will be used to directly probe the dust and extend the empirical relationship found by Cardelli, Clayton, & Mathis (1989, CCM) into the Spitzer infrared. We will use IRS spectra from 5-38 microns, IRAC 3-8 micron, IRS blue peakup, and MIPS 24 micron photometry to ensure accurate photometric calibration. The extinction curves created from these data will represent the first accurate measurement of the extinction between 5 and 38 microns for along lines of sight which probe dust in the diffuse interstellar medium. A unique and valuable aspect of the proposed research will be the direct measurement of extinction from the UV to the far-IR in the same lines of sight enabling the extension of the empirical CCM relationship into the Spitzer infrared. In addition, dust parameters derived from these extinction curves will be far better constrained than in previous studies where the ultraviolet through near-IR extinction and mid-IR extinction curves were taken from different sightlines with different environmental conditions. The accurate measurement of the infrared extinction will provide valuable constraints on dust grain materials, both from prominent feature (eg.,10 micron silicate feature) and continuum extinction measurements as a function of environment [eg. R(V)]. The extension of the CCM relationship into the mid-infrared will undoubtedly be of use in many other Spitzer programs.
Clayton Geoff
Gordon Karl
Misselt Karl
Pendleton Yvonne
Rieke George
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