Clear Aperture Fractional Transmission for Point Sources

Details Clear Aperture Fractional Transmission for Point Sources Clear Aperture Fractional Transmission for Point Sources

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stis.rept...20b&link_type=abstract

STIS Instrument Science Report 98-20, 31 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph

Scientific paper

The fractional transmission as a function of wavelength for stellar objects is measured for clear apertures by comparing count rates through small apertures to open aperture count rates in STIS first order modes. Because OTA "breathing" causes the throughput of the smallest apertures to vary on short time scales, the best estimate of the aperture throughputs is a theoretical model that is based on PSFs generated by optical modeling software. The photometric repeatability of the slit transmissions improves with increasing aperture size from 12% rms for the 52x0.05 arcsec aperture to 2.7% rms for the 52x0.5 slit to 1.3% rms for the 52x2 slit. Even for the 52x2 slit, the full range of this scatter is seen within one orbit for observations of the same star. The photometric repeatability of shorter echelle slits is probably comparable to the uncertainty in a long slit of similar width.

Affiliated with

Also associated with

No associations

Rating

Clear Aperture Fractional Transmission for Point Sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Clear Aperture Fractional Transmission for Point Sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clear Aperture Fractional Transmission for Point Sources will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1101300