Infrared Measurements of AFGL (Air Force Geophysics Laboratory) Sources.
Final rept. Mar 80-Sep 83,
WYOMING UNIV LARAMIE DEPT OF PHYSICS AND ASTRONOMY
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We report infrared positions and multicolor infrared photometry for a sample of type II OHIR stars. The infrared colors and 11.4 -micrometer silicate optical depths of the low-latitude sources in this group increase as a function of distance, suggesting that interstellar reddening must be taken into account in assessing their infrared energy distributions. Redding gradients between 1 and 3 times higher than the mean gradient in the direction of the galactic center are required to account for the observed color-distance correlation, a fact which might be explained by these stars confinement to spiral arms. The noise limited magnitudes for the AFGL Infrared Sky Survey have been estimated by direct comparison with ground based observations. Using these limiting magnitudes pruned versions of teh AFGL catalog have been generated. Infrared observations of all the stellar objects seen at 11, 20 or 27 micrometers and a statistical sample of the stars seen only at 4 micrometers are reported. Analysis of the observations leads to estimates of the absolute 4 and 10 micrometers magnitudes and space densities for the two classes of objects. The expected results from the Infrared Astronomical Satellite are re-examined. Author
- Infrared Detection and Detectors