Intermediate-brightness equatorial spectrophotometric standards

We have obtained spectral energy distributions for 41 7^sup m^-8^sup m^ stars near the celestial equator (δ=±3°). The λλ3100-7600 Å spectral range is studied with a spectral resolution of 50 Å. The relative rms error in the visible is 1-2%, increasing to 3-5% towards the edges of the wavelength interval studied. All stars are referenced to a single standard, the circumpolar star HD 221525. The synthetic colors of common stars are compared with those observed in four photometric systems: U BV, W BV R, uvby, and that of the TYCHO catalog. The program stars are recommended as secondary spectrophotometric standards.[PUBLICATION ABSTRACT]