FOS Aperture Throughput and Blue-To Offset

Details FOS Aperture Throughput and Blue-To Offset FOS Aperture Throughput and Blue-To Offset

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.4211b&link_type=abstract

HST Proposal ID #4211

Physics

Hst Proposal Id #4211

Scientific paper

Part I is a check of the small aperture transmissions that were determined in cycle 1 for the PRISM, G190H, and G160L in the 0.3, 0.5, 1.0, 2.5x2.0 (slit), and 4.3 arcsec apertures. A four stage peakup of the standard star should provide excellent centering in the small apertures. This program is the first check on the these small aperture transmissions relative to the 4.3 aperture since the execution of the SV proposal (3106) that determined the ratios. If the transmissions do not repeat to few percent, then a regular monitoring of the small apertures is required to determine the statistical uncertainty in the photometric repeatablity of small aperture FOS spectra. Part 2 is a measurement of the offset of the blue side apertures with respect to the red side. Since the peakup on the first side provides a precisely centered target, the switch to the second side followed by the peakup in the 0.3 aperture determines an accurate measure of the separation of the blue and red side apertures in the focal plane with no extra expenditure of observing time.

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