FOS Instrument Science Report 107

"PRE-COSTAR FOS APERTURE THROUGHPUTS FOR MIS-CENTERED TARGETS DERIVED FROM
PSF MODELS"
by I. N. Evans

Abstract excerpted from the report:
	Monochromatic pre-COSTAR aperture relative throughputs for the FOS
	have been computed from model point spread functions for point source
	targets that are mis-centered in the FOS apertures.  Model aperture 
   	throughputs relative to a perfectly centered point source target are
	presented for each of the non-occulting FOS apertures.  Plots of the
	maximum and minimum aperture relative throughput versus radius are 
	presented for use when the position angle of the offset target vector
	is unknown, and in the form of contour plots of the aperture relative
	throughputs versus offset X and Y for use when the precise offset is
	known.  The model aperture relative throughputs agree with the 
	observational data except in the case of the 4.3 aperture, where the
	observed flux is lower than predicted for large target offsets.



For more information, please contact the above authors.