Exposure Time Calibration in High Background Fields

Details Exposure Time Calibration in High Background Fields Exposure Time Calibration in High Background Fields

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.4775l&link_type=abstract

HST Proposal ID #4775

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #4775

Scientific paper

FGS CHARACTERIZATION. This proposal aims at the determination of the minimum observing time for TRANSfer Mode observing when point-like targets are projected against high background fields. Coupling of the OTA spherical aberration with FGS internal misalignments induces spurious correlation even in a beam of incoherent light as that from a perfectly flat background. This is further complicated when, as is the case for much cluster work, the backgrounds are strong and have steep luminosity gradients or are themselves variable. Observations will be performed in the center of the astrometer FGS. This proposal incorporates parts of STAT SV proposal AST-SV-01.

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