Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7935s&link_type=abstract
HST Proposal ID #7935
Other
Hst Proposal Id #7935
Scientific paper
This program is to test the scientific capabilities and some of the implementation procedures of the STIS cross-disperser modes. The sensitivity of the cross-disperser modes in a few settings will be determined using a standard star. Slit throughputs of the orthogonal slits will also be determined using different slits. The results would be useful in determining the limiting magnitudes {for a given S/N and exposure time} for different cross-disperser modes. One of the main rationale behind making these cross-disperser modes not available in cycle 7 was the fact that the NUV and FUV MAMA detectors are positioned such that the light in the cross-disperser modes falls in both NUV and FUV-MAMA detectors simultaneously. Thus the BOP checking procedure was complicated. Now that the MAMA detectors can be switched off at any given time, that is less of a constraint. However, it will be necessary to restrict the use of the cross-disperser modes to one detector at a time. Therefore to implement their use, the ground s ystem would have to be modified to allow the use of only one MAMA per visit when the cross-dispersers are used and shut off the other MAMA. For this proposal, however, both MAMAs can be kept on. The target is chosen such that there is no overlight if both detectors are on at the same time.
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