Keywords :
Fundamental parameters of stars
Abstract:A challenge in absolute calibration is to relate very bright stars with physical flux measurements to faint ones within range of modern instruments, e.g., those on large ground-based telescopes or the James Webb Space Telescope (JWST). We propose Sirius as the fiducial color standard. It is an A0V star that is slowly rotating and does not have infrared excesses due to either hot dust or a planetary debris disk; it also has a number of accurate (~1%-2%) absolute flux measurements. We accurately transfer the near-infrared flux from Sirius to BD+601753, an unobscured early A-type star (A1V, V~9.6, E(B-V)~0.009) that is faint enough to serve as a primary absolute flux calibrator for JWST. Its near-infrared spectral energy distribution and that of
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