Physics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11068b&link_type=abstract
HST Proposal ID #11068. Cycle 15
Physics
Scientific paper
Now that the Cohen A-star fluxes have been verified in the IR by the four cycle 14 NICMOS grism observations from program 10754, verification of four more of these Cohen SEDs will be done in Cycle 15. All 8 stars are selected from the Spitzer IRAC photometric calibration target lists, Tables 1-2 in Reach et al. 2005, PASP, 117,978; and all 8 A-stars are near the north ecliptic pole, ie near the JWST continuous viewing zone. The baseline plan for JWST NIRSpec calibration is to use the Cohen modeled flux beyond the 2.5micron NICMOS limit. Because of intrinsic variation within the same spectral type there is some statistical scatter expected in the precision of the Cohen flux extrapolation that is based on models. Thus, the ensemble JWST flux calibration based on an average over 8 stars should be sqrt8 more accurate than a sensitivity based on just one A-star. In addition to JWST calibration, this program supports spectrophotometric cross calibration of HST and Spitzer. The targets are chosen to be faint enough for unsaturated observations with JWST NIRSpec, yet still bright enough for high signal to noise in relatively short observations with HST+NICMOS and with Spitzer+IRAC.
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