FOS Instrument Science Report 120

"FOS Aperture Transmissions for Point Sources"
by R.C. Bohlin

Abstract excerpted from the report:
	The FOS absolute sensitivities are determined by observations
	of standard stars in the 4.3" acquisition aperture.  For estimates
	of absolute fluxes of point sources that are observed in smaller
	apertures, the apparent, measured transmission of the smaller aperture
	relative to the 4.3" aperture is required.  In addition to the
	proposls 3106 and 4211 that were analyzed for the earlier CAL/FOS-106
	(Bohlin 1993), more recent data from propids 5046 and 5048 confirm
	the throughputs for th B3(1") and C2(slit) single apertures.  Along
	with an early propid, 2823, the 5046 and 5048 data also determine
	aperture corrections for some of the square aperture pairs C1(1"),
	A2(.5"), and A3(.25").





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