Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ftp/instrument_news/FOS/pub/fos_isr107_a.txt Дата изменения: Wed Oct 11 23:48:23 1995 Дата индексирования: Sun Dec 23 05:13:30 2007 Кодировка: Поисковые слова: crater

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.