Abstract
The 60 and 100 micron cirrus emission around 256 lines of sight in the IRAS all-sky survey was measured, and the flux averages were used to study the distribution, variations, and correlations of the IRAS infrared cirrus fluxes with various interstellar parameters. It was found that the 60 and 100 micron fluxes correlate with the depletion of Si and show a trend with the depletion of Fe for 51 lines of sight toward the Galactic halo. No correlation was found with the abundances of Si, Mn, Fe, S, or Zn or with abundance ratios for the full sample of 256 stars. An abundance ratio of about 3 x 10 to the 7th by number relative to H was derived from 60 and 100 micron flux ratios and the H column along the line of sight; this ratio appears to decrease by a factor of 10 into the halo.
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