Faint Standard Extension {FASTEX}

Details Faint Standard Extension {FASTEX} Faint Standard Extension {FASTEX}

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9631b&link_type=abstract

HST Proposal ID #9631

Other

Hst Proposal Id #9631

Scientific paper

Fainter standard stars are needed for the flux calibration of COS, for the prism modes on ACS, and for astromomical community, in general. The bright object safety limit for COS is 1.25 ct/s per pixel, while the total countrate limit per FUV detector segment is 20000/s. In addition, the GALEX project {see Appendix} requires more secondary standards in the flux range of the two fainter original FASTEX stars. Customarily, one NASA project provides observing time in support of other NASA projects. The existing observations of the two fainter FASTEX standards, WD0947+857 and WD1657+343, have the most CTE losses in the G430L data and are still a bit marginal on S/N. Since the stellar models are normalized to V, good spectrophotometry to 5500A is important. All five targets will be observed at the new G430L aperture to minimize CTE loss and at the original aperture to constrain CTE models. Combined with additional planned cal data for stars of intermediate flux, the CTE model for spectra can be tuned to cover the full range of signal levels.

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