E1 Pseudo Apertures: Sensitivity and Throughputs

Details E1 Pseudo Apertures: Sensitivity and Throughputs E1 Pseudo Apertures: Sensitivity and Throughputs

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9616p&link_type=abstract

HST Proposal ID #9616

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Hst Proposal Id #9616

Scientific paper

The E1 pseudo-aperture locations were implemented to allow spectra to be taken easily near row 900. By moving a spectrum closer to the readout, the number of parallel charge transfers is reduced by about a factor of four, with a comparable reduction expected in the losses due to charge transfer inefficiency during the readout. There is, however, some evidence that the detector sensitivity and focus near row 900 differ by a few percent from that near the middle of the detector. This results in errors in the extracted fluxes that may differ from aperture-to-aperture. While some limited data is already available, in order to improve the absolute accuracy of the calibration, additional observations of one of the hot white dwarf standards would be extremely useful, both to verify the other results, and to check the stability of the PSF and aperture throughputs near row 900. We will therefore observe BD+75D325 with the G230LB, G430L, and G750L through a variety of supported slits. We will also explore a variety of strategies for improving fringe flat subtraction near the E1 positions. This will include using the slit-step optional parameter to move a small slit to row 900, and adding postargs to large aperture observations to better align the source with the 52X0.1 slit used for the fringe flat. Relative aperture locations will also be checked by a series of G430L wavecals taken through a variety of apertures.

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