... The absolute flux calibration of NICMOS will be calculated from observations of standard stars with known flux distributions F( ). ... In order to expand the set of IR standard stars in the appropriate flux range for NICMOS, M. Rieke, R. Thompson, and collaborators at the University of Arizona are making photometric observations of solar-analog stars, which will be used to normalize the solar spectrum to the observed IR magnitudes. ... Relative flux references accurate to 1.5% for standard...

ST-ECF Instrument Science Report ACS 2003-001 The in-orbit wavelength calibration of the WFC G800L grism A. Pasquali, N. Pirzkal, J.R. Walsh March 5, 2003 ABSTRACT We present the G800L grism spectra of the Wolf-Rayet stars WR45 and WR96 acquired with the Wide Field Channel during the Servicing Mission Orbital Verification (SMOV) tests and the early Cycle 11 INTERIM calibration programme. ... The grism 1st order spectra of WR45 (left) and WR96 (right) are shown in Figure 6. ...

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