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The Space Telescope Imaging Spectrograph (STIS) has measured the spectralenergy distributions (SEDs) for several stars of types O, B, A, F, and G. Theseabsolute fluxes from the CALSPEC database are fit with a new spectral gridcomputed from the ATLAS-APOGEE ATLAS9 model atmosphere database using achi-square minimization technique in four parameters. The quality of the fitsare compared for complete LTE grids by Castelli & Kurucz (CK04) and our newcomprehensive LTE grid (BOSZ). For the cooler stars, the fits with the MARCSLTE grid are also evaluated, while the hottest stars are also fit with the NLTELanz & Hubeny OB star grids. Unfortunately, these NLTE models do not transitionsmoothly in the infrared to agree with our new BOSZ LTE grid at the NLTE lowerlimit of Teff =15,000K.  The new BOSZ grid is available via the Space Telescope Institute MAST archiveand has a much finer sampled IR wavelength scale than CK04, which willfacilitate the modeling of stars observed by the James Webb Space Telescope(JWST). Our result for the angular diameter of Sirius agrees with the ground-based interferometric value.

A New Stellar Atmosphere Grid and Comparisons with HST/STIS Calspec Flux Distributions