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GHRS Instrument Science Report 059

GHRS Instrument Science Report 059

"SMOV Proposal 4258: Pre-COSTAR Baseline Sensitivity"

David R. Soderblom, Lisa E. Sherbert and Stephen J. Hulbert

Abstract excerpted from the report:

SMOV Proposal 4258 was executed 21 December 1993. Observations
of the standard star BD + 28 degrees 4211 were taken with the
three first order gratings (G160M, G200M, and G270M) at five
wavelengths (1200, 1500, 2000, 2500, and 3000 A) in both the large 
science aperture (LSA) and the small (SSA). The LSA observation at
3000 A was lost due to a carrousel reset. An increase of approximately
9% in throughput was seen which has been attributed to a movement of the
secondary mirror. Fluxes of targets observed with the GHRS in 
Cycle 3.5 may appear to be too high by amounts which will depend
on the secondary mirror position but which should be predictable.