B star colours between 2000 and 3000 angstroms

Abstract

Ultraviolet fluxes at 2200 and 2600 Å have been measured for about 180 B and A stars using filter photometers in rockets. Forty-eight of these stars have been observed more than once, and an analysis of these data show the uncertainty of a single observation to be less than 20 %. A U-V color versus B-V plot of luminosity class III, IV and V stars with little reddening shows a degree of correlation consistent with the observational uncertainty. The data appears to be of sufficient quality for use in deriving B star temperatures and interstellar scattering curves.