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Exoplanets have sparked interest in extremely high signal-to-noise ratiospectroscopic observations of very bright stars, in a regime where fluxcalibrators, in particular DA white dwarfs, are not available. We argue thatA-type stars offer a useful alternative and reliable space-basedspectrophotometry is now available for a number of bright ones in the range3<V<8 mag. By means of comparing observed spectrophotometry and model fluxes,we identify 18 new very-bright trustworthy A-type flux standards for theoptical range (400-800 nm), and provide scaled model fluxes for them. Our testssuggest that the absolute fluxes for these stars in the optical are reliable towithin 3%. We limit the spectral range to 400-800 nm, since our models havedifficulties to reproduce the observed fluxes in the near-infrared and,especially, in the near-UV, where the discrepancies rise up to ~ 10%. Based onour model fits, we derive angular diameters with an estimated accuracy of about1%.

New bright optical spectrophotometric standards: A-type stars from the STIS Next Generation Spectral Library